diff --git a/pint/compat.py b/pint/compat.py
index 4f34a1843..552ff3f7e 100644
--- a/pint/compat.py
+++ b/pint/compat.py
@@ -325,21 +325,28 @@ def isnan(obj: Any, check_all: bool) -> Union[bool, Iterable[bool]]:
         Always return False for non-numeric types.
     """
     if is_duck_array_type(type(obj)):
-        if obj.dtype.kind in "if":
+        if obj.dtype.kind in "ifc":
             out = np.isnan(obj)
         elif obj.dtype.kind in "Mm":
             out = np.isnat(obj)
         else:
-            # Not a numeric or datetime type
-            out = np.full(obj.shape, False)
+            if HAS_UNCERTAINTIES:
+                try:
+                    out = unp.isnan(obj)
+                except TypeError:
+                    # Not a numeric or UFloat type
+                    out = np.full(obj.shape, False)
+            else:
+                # Not a numeric or datetime type
+                out = np.full(obj.shape, False)
         return out.any() if check_all else out
     if isinstance(obj, np_datetime64):
         return np.isnat(obj)
+    elif HAS_UNCERTAINTIES and isinstance(obj, UFloat):
+        return unp.isnan(obj)
     try:
         return math.isnan(obj)
     except TypeError:
-        if HAS_UNCERTAINTIES:
-            return unp.isnan(obj)
         return False
 
 
diff --git a/pint/facets/__init__.py b/pint/facets/__init__.py
index 4fd1597a6..22fbc6ce1 100644
--- a/pint/facets/__init__.py
+++ b/pint/facets/__init__.py
@@ -7,7 +7,7 @@
     keeping each part small enough to be hackable.
 
     Each facet contains one or more of the following modules:
-    - definitions: classes describing an specific unit related definiton.
+    - definitions: classes describing specific unit-related definitons.
       These objects must be immutable, pickable and not reference the registry (e.g. ContextDefinition)
     - objects: classes and functions that encapsulate behavior (e.g. Context)
     - registry: implements a subclass of PlainRegistry or class that can be
diff --git a/pint/testsuite/test_issues.py b/pint/testsuite/test_issues.py
index add5b4c01..c98ac61bf 100644
--- a/pint/testsuite/test_issues.py
+++ b/pint/testsuite/test_issues.py
@@ -881,6 +881,7 @@ def test_issue_1300(self):
         m = module_registry.Measurement(1, 0.1, "meter")
         assert m.default_format == "~P"
 
+    @helpers.requires_babel()
     def test_issue_1400(self, sess_registry):
         q1 = 3 * sess_registry.W
         q2 = 3 * sess_registry.W / sess_registry.cm
diff --git a/pyproject.toml b/pyproject.toml
index cdec7775e..4b6b7312d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,8 +44,7 @@ testbase = [
     "pytest",
     "pytest-cov",
     "pytest-subtests",
-    "pytest-benchmark",
-    "babel"
+    "pytest-benchmark"
 ]
 test = [
     "pytest",