diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eb395266..8cf619fb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -56,6 +56,7 @@ jobs:
           path: tests/.coverage*
           if-no-files-found: ignore
           retention-days: 1
+          include-hidden-files: true
 
   tests-postgres:
     runs-on: ubuntu-latest
@@ -105,6 +106,7 @@ jobs:
           path: tests/.coverage*
           if-no-files-found: ignore
           retention-days: 1
+          include-hidden-files: true
 
   coverage:
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3da9eb32..4ff0a895 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Fixed
 
 -   `value` not being queryable on `EmbedBlock` ([#399](https://github.com/torchbox/wagtail-grapple/pull/399))@JakubMastalerz
+-   Circular import when defining custom `PageInterface` ([#404](https://github.com/torchbox/wagtail-grapple/pull/404)) @mgax
 
 ## [0.26.0] - 2024-06-26
 
diff --git a/docs/getting-started/settings.rst b/docs/getting-started/settings.rst
index 8d3d0aad..23f37179 100644
--- a/docs/getting-started/settings.rst
+++ b/docs/getting-started/settings.rst
@@ -152,4 +152,4 @@ Wagtail Page interface
 Used to construct the schema for Wagtail Page-derived models. It can be overridden to provide a custom interface for all
 page models.
 
-Default: ``grapple.types.pages.PageInterface``
+Default: ``grapple.types.interfaces.PageInterface``
diff --git a/grapple/models.py b/grapple/models.py
index 5c8d9920..2b094338 100644
--- a/grapple/models.py
+++ b/grapple/models.py
@@ -151,7 +151,7 @@ def Mixin():
 
 def GraphQLPage(field_name: str, **kwargs):
     def Mixin():
-        from .types.pages import get_page_interface
+        from .types.interfaces import get_page_interface
 
         return GraphQLField(field_name, get_page_interface(), **kwargs)
 
diff --git a/grapple/settings.py b/grapple/settings.py
index c543eca5..3c5d10ae 100644
--- a/grapple/settings.py
+++ b/grapple/settings.py
@@ -28,7 +28,7 @@
     "PAGE_SIZE": 10,
     "MAX_PAGE_SIZE": 100,
     "RICHTEXT_FORMAT": "html",
-    "PAGE_INTERFACE": "grapple.types.pages.PageInterface",
+    "PAGE_INTERFACE": "grapple.types.interfaces.PageInterface",
 }
 
 # List of settings that have been deprecated
diff --git a/grapple/types/interfaces.py b/grapple/types/interfaces.py
new file mode 100644
index 00000000..84c41c14
--- /dev/null
+++ b/grapple/types/interfaces.py
@@ -0,0 +1,211 @@
+import inspect
+
+import graphene
+
+from django.contrib.contenttypes.models import ContentType
+from django.utils.module_loading import import_string
+from graphql import GraphQLError
+from wagtail import blocks
+from wagtail.models import Page as WagtailPage
+from wagtail.rich_text import RichText
+
+from ..registry import registry
+from ..settings import grapple_settings
+from ..utils import resolve_queryset, serialize_struct_obj
+from .structures import QuerySetList
+
+
+def get_page_interface():
+    return import_string(grapple_settings.PAGE_INTERFACE)
+
+
+class PageInterface(graphene.Interface):
+    id = graphene.ID()
+    title = graphene.String(required=True)
+    slug = graphene.String(required=True)
+    content_type = graphene.String(required=True)
+    page_type = graphene.String()
+    live = graphene.Boolean(required=True)
+
+    url = graphene.String()
+    url_path = graphene.String(required=True)
+
+    depth = graphene.Int()
+    seo_title = graphene.String(required=True)
+    search_description = graphene.String()
+    show_in_menus = graphene.Boolean(required=True)
+
+    locked = graphene.Boolean()
+
+    first_published_at = graphene.DateTime()
+    last_published_at = graphene.DateTime()
+
+    parent = graphene.Field(get_page_interface)
+    children = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+    siblings = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+    next_siblings = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+    previous_siblings = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+    descendants = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+    ancestors = QuerySetList(
+        graphene.NonNull(get_page_interface), enable_search=True, required=True
+    )
+
+    search_score = graphene.Float()
+
+    @classmethod
+    def resolve_type(cls, instance, info, **kwargs):
+        """
+        If model has a custom Graphene Node type in registry then use it,
+        otherwise use base page type.
+        """
+        from .pages import Page
+
+        return registry.pages.get(type(instance), Page)
+
+    def resolve_content_type(self, info, **kwargs):
+        self.content_type = ContentType.objects.get_for_model(self)
+        return (
+            f"{self.content_type.app_label}.{self.content_type.model_class().__name__}"
+        )
+
+    def resolve_page_type(self, info, **kwargs):
+        return get_page_interface().resolve_type(self.specific, info, **kwargs)
+
+    def resolve_parent(self, info, **kwargs):
+        """
+        Resolves the parent node of current page node.
+        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_parent
+        """
+        try:
+            return self.get_parent().specific
+        except GraphQLError:
+            return WagtailPage.objects.none()
+
+    def resolve_children(self, info, **kwargs):
+        """
+        Resolves a list of live children of this page.
+        Docs: https://docs.wagtail.io/en/stable/reference/pages/queryset_reference.html#examples
+        """
+        return resolve_queryset(
+            self.get_children().live().public().specific(), info, **kwargs
+        )
+
+    def resolve_siblings(self, info, **kwargs):
+        """
+        Resolves a list of sibling nodes to this page.
+        Docs: https://docs.wagtail.io/en/stable/reference/pages/queryset_reference.html?highlight=get_siblings#wagtail.query.PageQuerySet.sibling_of
+        """
+        return resolve_queryset(
+            self.get_siblings().exclude(pk=self.pk).live().public().specific(),
+            info,
+            **kwargs,
+        )
+
+    def resolve_next_siblings(self, info, **kwargs):
+        """
+        Resolves a list of direct next siblings of this page. Similar to `resolve_siblings` with sorting.
+        Source: https://github.com/wagtail/wagtail/blob/master/wagtail/core/models.py#L1384
+        """
+        return resolve_queryset(
+            self.get_next_siblings().exclude(pk=self.pk).live().public().specific(),
+            info,
+            **kwargs,
+        )
+
+    def resolve_previous_siblings(self, info, **kwargs):
+        """
+        Resolves a list of direct prev siblings of this page. Similar to `resolve_siblings` with sorting.
+        Source: https://github.com/wagtail/wagtail/blob/master/wagtail/core/models.py#L1387
+        """
+        return resolve_queryset(
+            self.get_prev_siblings().exclude(pk=self.pk).live().public().specific(),
+            info,
+            **kwargs,
+        )
+
+    def resolve_descendants(self, info, **kwargs):
+        """
+        Resolves a list of nodes pointing to the current page’s descendants.
+        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_descendants
+        """
+        return resolve_queryset(
+            self.get_descendants().live().public().specific(), info, **kwargs
+        )
+
+    def resolve_ancestors(self, info, **kwargs):
+        """
+        Resolves a list of nodes pointing to the current page’s ancestors.
+        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_ancestors
+        """
+        return resolve_queryset(
+            self.get_ancestors().live().public().specific(), info, **kwargs
+        )
+
+    def resolve_seo_title(self, info, **kwargs):
+        """
+        Get page's SEO title. Fallback to a normal page's title if absent.
+        """
+        return self.seo_title or self.title
+
+    def resolve_search_score(self, info, **kwargs):
+        """
+        Get page's search score, will be None if not in a search context.
+        """
+        return getattr(self, "search_score", None)
+
+
+class StreamFieldInterface(graphene.Interface):
+    id = graphene.String()
+    block_type = graphene.String(required=True)
+    field = graphene.String(required=True)
+    raw_value = graphene.String(required=True)
+
+    @classmethod
+    def resolve_type(cls, instance, info):
+        """
+        If block has a custom Graphene Node type in registry then use it,
+        otherwise use generic block type.
+        """
+        if hasattr(instance, "block"):
+            mdl = type(instance.block)
+            if mdl in registry.streamfield_blocks:
+                return registry.streamfield_blocks[mdl]
+
+            for block_class in inspect.getmro(mdl):
+                if block_class in registry.streamfield_blocks:
+                    return registry.streamfield_blocks[block_class]
+
+        return registry.streamfield_blocks["generic-block"]
+
+    def resolve_id(self, info, **kwargs):
+        return self.id
+
+    def resolve_block_type(self, info, **kwargs):
+        return type(self.block).__name__
+
+    def resolve_field(self, info, **kwargs):
+        return self.block.name
+
+    def resolve_raw_value(self, info, **kwargs):
+        if isinstance(self, blocks.StructValue):
+            # This is the value for a nested StructBlock defined via GraphQLStreamfield
+            return serialize_struct_obj(self)
+        elif isinstance(self.value, dict):
+            return serialize_struct_obj(self.value)
+        elif isinstance(self.value, RichText):
+            # Ensure RichTextBlock raw value always returns the "internal format", rather than the conterted value
+            # as per https://docs.wagtail.io/en/stable/extending/rich_text_internals.html#data-format.
+            # Note that RichTextBlock.value will be rendered HTML by default.
+            return self.value.source
+
+        return self.value
diff --git a/grapple/types/pages.py b/grapple/types/pages.py
index 58a460db..98e35456 100644
--- a/grapple/types/pages.py
+++ b/grapple/types/pages.py
@@ -2,7 +2,6 @@
 
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import Q
-from django.utils.module_loading import import_string
 from django.utils.translation import gettext_lazy as _
 from graphene_django.types import DjangoObjectType
 from graphql import GraphQLError
@@ -10,158 +9,11 @@
 from wagtail.models import Site
 
 from ..registry import registry
-from ..settings import grapple_settings
 from ..utils import resolve_queryset, resolve_site_by_hostname
+from .interfaces import get_page_interface
 from .structures import QuerySetList
 
 
-def get_page_interface():
-    return import_string(grapple_settings.PAGE_INTERFACE)
-
-
-class PageInterface(graphene.Interface):
-    id = graphene.ID()
-    title = graphene.String(required=True)
-    slug = graphene.String(required=True)
-    content_type = graphene.String(required=True)
-    page_type = graphene.String()
-    live = graphene.Boolean(required=True)
-
-    url = graphene.String()
-    url_path = graphene.String(required=True)
-
-    depth = graphene.Int()
-    seo_title = graphene.String(required=True)
-    search_description = graphene.String()
-    show_in_menus = graphene.Boolean(required=True)
-
-    locked = graphene.Boolean()
-
-    first_published_at = graphene.DateTime()
-    last_published_at = graphene.DateTime()
-
-    parent = graphene.Field(get_page_interface)
-    children = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-    siblings = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-    next_siblings = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-    previous_siblings = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-    descendants = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-    ancestors = QuerySetList(
-        graphene.NonNull(get_page_interface), enable_search=True, required=True
-    )
-
-    search_score = graphene.Float()
-
-    @classmethod
-    def resolve_type(cls, instance, info, **kwargs):
-        """
-        If model has a custom Graphene Node type in registry then use it,
-        otherwise use base page type.
-        """
-        return registry.pages.get(type(instance), Page)
-
-    def resolve_content_type(self, info, **kwargs):
-        self.content_type = ContentType.objects.get_for_model(self)
-        return (
-            f"{self.content_type.app_label}.{self.content_type.model_class().__name__}"
-        )
-
-    def resolve_page_type(self, info, **kwargs):
-        return get_page_interface().resolve_type(self.specific, info, **kwargs)
-
-    def resolve_parent(self, info, **kwargs):
-        """
-        Resolves the parent node of current page node.
-        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_parent
-        """
-        try:
-            return self.get_parent().specific
-        except GraphQLError:
-            return WagtailPage.objects.none()
-
-    def resolve_children(self, info, **kwargs):
-        """
-        Resolves a list of live children of this page.
-        Docs: https://docs.wagtail.io/en/stable/reference/pages/queryset_reference.html#examples
-        """
-        return resolve_queryset(
-            self.get_children().live().public().specific(), info, **kwargs
-        )
-
-    def resolve_siblings(self, info, **kwargs):
-        """
-        Resolves a list of sibling nodes to this page.
-        Docs: https://docs.wagtail.io/en/stable/reference/pages/queryset_reference.html?highlight=get_siblings#wagtail.query.PageQuerySet.sibling_of
-        """
-        return resolve_queryset(
-            self.get_siblings().exclude(pk=self.pk).live().public().specific(),
-            info,
-            **kwargs,
-        )
-
-    def resolve_next_siblings(self, info, **kwargs):
-        """
-        Resolves a list of direct next siblings of this page. Similar to `resolve_siblings` with sorting.
-        Source: https://github.com/wagtail/wagtail/blob/master/wagtail/core/models.py#L1384
-        """
-        return resolve_queryset(
-            self.get_next_siblings().exclude(pk=self.pk).live().public().specific(),
-            info,
-            **kwargs,
-        )
-
-    def resolve_previous_siblings(self, info, **kwargs):
-        """
-        Resolves a list of direct prev siblings of this page. Similar to `resolve_siblings` with sorting.
-        Source: https://github.com/wagtail/wagtail/blob/master/wagtail/core/models.py#L1387
-        """
-        return resolve_queryset(
-            self.get_prev_siblings().exclude(pk=self.pk).live().public().specific(),
-            info,
-            **kwargs,
-        )
-
-    def resolve_descendants(self, info, **kwargs):
-        """
-        Resolves a list of nodes pointing to the current page’s descendants.
-        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_descendants
-        """
-        return resolve_queryset(
-            self.get_descendants().live().public().specific(), info, **kwargs
-        )
-
-    def resolve_ancestors(self, info, **kwargs):
-        """
-        Resolves a list of nodes pointing to the current page’s ancestors.
-        Docs: https://docs.wagtail.io/en/stable/reference/pages/model_reference.html#wagtail.models.Page.get_ancestors
-        """
-        return resolve_queryset(
-            self.get_ancestors().live().public().specific(), info, **kwargs
-        )
-
-    def resolve_seo_title(self, info, **kwargs):
-        """
-        Get page's SEO title. Fallback to a normal page's title if absent.
-        """
-        return self.seo_title or self.title
-
-    def resolve_search_score(self, info, **kwargs):
-        """
-        Get page's search score, will be None if not in a search context.
-        """
-        return getattr(self, "search_score", None)
-
-
 class Page(DjangoObjectType):
     """
     Base Page type used if one isn't generated for the current model.
diff --git a/grapple/types/redirects.py b/grapple/types/redirects.py
index 540f3f0b..23085f23 100644
--- a/grapple/types/redirects.py
+++ b/grapple/types/redirects.py
@@ -9,7 +9,7 @@
 
 from grapple.types.sites import SiteObjectType
 
-from .pages import get_page_interface
+from .interfaces import get_page_interface
 
 
 class RedirectObjectType(graphene.ObjectType):
diff --git a/grapple/types/sites.py b/grapple/types/sites.py
index 87c9c08c..51358fd8 100644
--- a/grapple/types/sites.py
+++ b/grapple/types/sites.py
@@ -10,7 +10,8 @@
 from wagtail.models import Site
 
 from ..utils import resolve_queryset, resolve_site_by_hostname, resolve_site_by_id
-from .pages import get_page_interface, get_specific_page
+from .interfaces import get_page_interface
+from .pages import get_specific_page
 from .structures import QuerySetList
 
 
diff --git a/grapple/types/streamfield.py b/grapple/types/streamfield.py
index f979ffbd..7c2aa844 100644
--- a/grapple/types/streamfield.py
+++ b/grapple/types/streamfield.py
@@ -1,5 +1,3 @@
-import inspect
-
 from typing import Optional
 
 import graphene
@@ -18,9 +16,9 @@
 from wagtail.embeds.embeds import get_embed
 from wagtail.embeds.exceptions import EmbedException
 from wagtail.fields import StreamField
-from wagtail.rich_text import RichText
 
 from ..registry import registry
+from .interfaces import StreamFieldInterface
 from .rich_text import RichText as RichTextType
 
 
@@ -40,53 +38,6 @@ def convert_stream_field(field, registry=None):
     )
 
 
-class StreamFieldInterface(graphene.Interface):
-    id = graphene.String()
-    block_type = graphene.String(required=True)
-    field = graphene.String(required=True)
-    raw_value = graphene.String(required=True)
-
-    @classmethod
-    def resolve_type(cls, instance, info):
-        """
-        If block has a custom Graphene Node type in registry then use it,
-        otherwise use generic block type.
-        """
-        if hasattr(instance, "block"):
-            mdl = type(instance.block)
-            if mdl in registry.streamfield_blocks:
-                return registry.streamfield_blocks[mdl]
-
-            for block_class in inspect.getmro(mdl):
-                if block_class in registry.streamfield_blocks:
-                    return registry.streamfield_blocks[block_class]
-
-        return registry.streamfield_blocks["generic-block"]
-
-    def resolve_id(self, info, **kwargs):
-        return self.id
-
-    def resolve_block_type(self, info, **kwargs):
-        return type(self.block).__name__
-
-    def resolve_field(self, info, **kwargs):
-        return self.block.name
-
-    def resolve_raw_value(self, info, **kwargs):
-        if isinstance(self, blocks.StructValue):
-            # This is the value for a nested StructBlock defined via GraphQLStreamfield
-            return serialize_struct_obj(self)
-        elif isinstance(self.value, dict):
-            return serialize_struct_obj(self.value)
-        elif isinstance(self.value, RichText):
-            # Ensure RichTextBlock raw value always returns the "internal format", rather than the conterted value
-            # as per https://docs.wagtail.io/en/stable/extending/rich_text_internals.html#data-format.
-            # Note that RichTextBlock.value will be rendered HTML by default.
-            return self.value.source
-
-        return self.value
-
-
 def generate_streamfield_union(graphql_types):
     class StreamfieldUnion(graphene.Union):
         class Meta:
@@ -118,41 +69,6 @@ def __init__(self, id, block, value=""):
         self.value = value
 
 
-def serialize_struct_obj(obj):
-    rtn_obj = {}
-
-    if hasattr(obj, "raw_data"):
-        rtn_obj = []
-        for field in obj[0]:
-            rtn_obj.append(serialize_struct_obj(field.value))
-    # This conditionnal and below support both Wagtail >= 2.13 and <2.12 versions.
-    # The "stream_data" check can be dropped once 2.11 is not supported anymore.
-    # Cf: https://docs.wagtail.io/en/stable/releases/2.12.html#stream-data-on-streamfield-values-is-deprecated
-    elif hasattr(obj, "stream_data"):
-        rtn_obj = []
-        for field in obj.stream_data:
-            rtn_obj.append(serialize_struct_obj(field["value"]))
-    else:
-        for field in obj:
-            value = obj[field]
-            if hasattr(value, "raw_data"):
-                rtn_obj[field] = [serialize_struct_obj(data.value) for data in value[0]]
-            elif hasattr(obj, "stream_data"):
-                rtn_obj[field] = [
-                    serialize_struct_obj(data["value"]) for data in value.stream_data
-                ]
-            elif hasattr(value, "value"):
-                rtn_obj[field] = value.value
-            elif hasattr(value, "src"):
-                rtn_obj[field] = value.src
-            elif hasattr(value, "file"):
-                rtn_obj[field] = value.file.url
-            else:
-                rtn_obj[field] = value
-
-    return rtn_obj
-
-
 class StructBlock(graphene.ObjectType):
     class Meta:
         interfaces = (StreamFieldInterface,)
@@ -437,7 +353,7 @@ def resolve_items(self, info, **kwargs):
 def register_streamfield_blocks():
     from .documents import get_document_type
     from .images import get_image_type
-    from .pages import get_page_interface
+    from .interfaces import get_page_interface
     from .snippets import SnippetTypes
 
     class PageChooserBlock(graphene.ObjectType):
diff --git a/grapple/utils.py b/grapple/utils.py
index ede62155..e4c9dafa 100644
--- a/grapple/utils.py
+++ b/grapple/utils.py
@@ -248,3 +248,38 @@ def get_media_item_url(cls):
     if url[0] == "/":
         return settings.BASE_URL + url
     return url
+
+
+def serialize_struct_obj(obj):
+    rtn_obj = {}
+
+    if hasattr(obj, "raw_data"):
+        rtn_obj = []
+        for field in obj[0]:
+            rtn_obj.append(serialize_struct_obj(field.value))
+    # This conditionnal and below support both Wagtail >= 2.13 and <2.12 versions.
+    # The "stream_data" check can be dropped once 2.11 is not supported anymore.
+    # Cf: https://docs.wagtail.io/en/stable/releases/2.12.html#stream-data-on-streamfield-values-is-deprecated
+    elif hasattr(obj, "stream_data"):
+        rtn_obj = []
+        for field in obj.stream_data:
+            rtn_obj.append(serialize_struct_obj(field["value"]))
+    else:
+        for field in obj:
+            value = obj[field]
+            if hasattr(value, "raw_data"):
+                rtn_obj[field] = [serialize_struct_obj(data.value) for data in value[0]]
+            elif hasattr(obj, "stream_data"):
+                rtn_obj[field] = [
+                    serialize_struct_obj(data["value"]) for data in value.stream_data
+                ]
+            elif hasattr(value, "value"):
+                rtn_obj[field] = value.value
+            elif hasattr(value, "src"):
+                rtn_obj[field] = value.src
+            elif hasattr(value, "file"):
+                rtn_obj[field] = value.file.url
+            else:
+                rtn_obj[field] = value
+
+    return rtn_obj
diff --git a/tests/settings_custom_page_interface.py b/tests/settings_custom_page_interface.py
index b688c247..319403fb 100644
--- a/tests/settings_custom_page_interface.py
+++ b/tests/settings_custom_page_interface.py
@@ -1,4 +1,4 @@
 from settings import *  # noqa: F403
 
 
-GRAPPLE["PAGE_INTERFACE"] = "testapp.interfaces.CustomInterface"  # noqa: F405
+GRAPPLE["PAGE_INTERFACE"] = "testapp.interfaces.CustomPageInterface"  # noqa: F405
diff --git a/tests/test_interfaces.py b/tests/test_interfaces.py
index 1ab7d826..6922e35e 100644
--- a/tests/test_interfaces.py
+++ b/tests/test_interfaces.py
@@ -5,9 +5,9 @@
 from django.test import override_settings, tag
 from test_grapple import BaseGrappleTestWithIntrospection
 from testapp.factories import BlogPageFactory, CustomInterfaceBlockFactory
-from testapp.interfaces import CustomInterface
+from testapp.interfaces import CustomPageInterface
 
-from grapple.types.pages import PageInterface, get_page_interface
+from grapple.types.interfaces import PageInterface, get_page_interface
 
 
 @skipIf(
@@ -35,9 +35,11 @@ def test_schema_with_default_page_interface(self):
             results["data"]["__type"]["interfaces"], [{"name": "PageInterface"}]
         )
 
-    @override_settings(GRAPPLE={"PAGE_INTERFACE": "testapp.interfaces.CustomInterface"})
+    @override_settings(
+        GRAPPLE={"PAGE_INTERFACE": "testapp.interfaces.CustomPageInterface"}
+    )
     def test_get_page_interface_with_custom_page_interface(self):
-        self.assertIs(get_page_interface(), CustomInterface)
+        self.assertIs(get_page_interface(), CustomPageInterface)
 
     def test_streamfield_block_with_custom_interface(self):
         query = """
@@ -104,5 +106,5 @@ class CustomPageInterfaceTestCase(BaseGrappleTestWithIntrospection):
     def test_schema_with_custom_page_interface(self):
         results = self.introspect_schema_by_type("BlogPage")
         self.assertListEqual(
-            results["data"]["__type"]["interfaces"], [{"name": "CustomInterface"}]
+            results["data"]["__type"]["interfaces"], [{"name": "CustomPageInterface"}]
         )
diff --git a/tests/testapp/interfaces.py b/tests/testapp/interfaces.py
index 327c371a..b473215d 100644
--- a/tests/testapp/interfaces.py
+++ b/tests/testapp/interfaces.py
@@ -1,5 +1,11 @@
 import graphene
 
+from grapple.types.interfaces import PageInterface
+
 
 class CustomInterface(graphene.Interface):
     custom_text = graphene.String()
+
+
+class CustomPageInterface(PageInterface):
+    custom_text = graphene.String()
diff --git a/tests/testapp/mutations.py b/tests/testapp/mutations.py
index 48cfc619..3e8f785a 100644
--- a/tests/testapp/mutations.py
+++ b/tests/testapp/mutations.py
@@ -3,7 +3,7 @@
 from wagtail.models import Page
 
 from grapple.registry import registry
-from grapple.types.pages import PageInterface
+from grapple.types.interfaces import PageInterface
 from grapple.types.rich_text import RichText
 from testapp.models import Advert, AuthorPage