diff --git a/MANIFEST.in b/MANIFEST.in
index eb5f06a..1ee3624 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,2 @@
-graft openfisca_extension_template
+graft src
 global-exclude *~ *.py[cod] *.so
diff --git a/Taskfile.yaml b/Taskfile.yaml
index 13d5f64..8e861ff 100644
--- a/Taskfile.yaml
+++ b/Taskfile.yaml
@@ -9,7 +9,7 @@ vars:
   YAML:
     sh: git ls-files "*.yaml" "*.yml"
   TEST:
-    sh: git ls-files "openfisca_extension_template/tests/*.yaml"
+    sh: git ls-files "tests/*.yaml"
   MD:
     sh: git ls-files "*.md"
   SH:
diff --git a/pyproject.toml b/pyproject.toml
index c966eb6..fae56b3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Topic :: Scientific/Engineering :: Information Analysis",
 ]
-packages = [ { include = "openfisca_extension_template", from = "." } ]
+packages = [ { include = "openfisca_extension_template", from = "src" } ]
 
 [tool.poetry.dependencies]
 python = "~3.9 || ~3.10 || ~3.11"
@@ -106,9 +106,9 @@ commands = [
     [
         "openfisca",
         "test",
+        "tests",
         "--country-package=openfisca_country_template",
         "--extensions=openfisca_extension_template",
-        "openfisca_extension_template/tests",
     ]
 ]
 commands_pre = [
diff --git a/openfisca_extension_template/__init__.py b/src/openfisca_extension_template/__init__.py
similarity index 100%
rename from openfisca_extension_template/__init__.py
rename to src/openfisca_extension_template/__init__.py
diff --git a/openfisca_extension_template/parameters/local_town/child_allowance/amount.yaml b/src/openfisca_extension_template/parameters/local_town/child_allowance/amount.yaml
similarity index 100%
rename from openfisca_extension_template/parameters/local_town/child_allowance/amount.yaml
rename to src/openfisca_extension_template/parameters/local_town/child_allowance/amount.yaml
diff --git a/openfisca_extension_template/parameters/local_town/child_allowance/index.yaml b/src/openfisca_extension_template/parameters/local_town/child_allowance/index.yaml
similarity index 100%
rename from openfisca_extension_template/parameters/local_town/child_allowance/index.yaml
rename to src/openfisca_extension_template/parameters/local_town/child_allowance/index.yaml
diff --git a/openfisca_extension_template/parameters/local_town/index.yaml b/src/openfisca_extension_template/parameters/local_town/index.yaml
similarity index 100%
rename from openfisca_extension_template/parameters/local_town/index.yaml
rename to src/openfisca_extension_template/parameters/local_town/index.yaml
diff --git a/openfisca_extension_template/tests/__init__.py b/src/openfisca_extension_template/variables/__init__.py
similarity index 100%
rename from openfisca_extension_template/tests/__init__.py
rename to src/openfisca_extension_template/variables/__init__.py
diff --git a/openfisca_extension_template/variables/local_benefit.py b/src/openfisca_extension_template/variables/local_benefit.py
similarity index 100%
rename from openfisca_extension_template/variables/local_benefit.py
rename to src/openfisca_extension_template/variables/local_benefit.py
diff --git a/openfisca_extension_template/variables/__init__.py b/tests/__init__.py
similarity index 100%
rename from openfisca_extension_template/variables/__init__.py
rename to tests/__init__.py
diff --git a/openfisca_extension_template/tests/local_benefit.yaml b/tests/local_benefit.yaml
similarity index 100%
rename from openfisca_extension_template/tests/local_benefit.yaml
rename to tests/local_benefit.yaml
diff --git a/openfisca_extension_template/tests/test_api.py b/tests/test_api.py
similarity index 100%
rename from openfisca_extension_template/tests/test_api.py
rename to tests/test_api.py