diff --git a/modeltranslation/_typing.py b/modeltranslation/_typing.py
index d884706f..d955ca3c 100644
--- a/modeltranslation/_typing.py
+++ b/modeltranslation/_typing.py
@@ -37,5 +37,4 @@ def class_getitem(cls: type, key: str | type | TypeVar):
         return cls
 
     for cls in classes:
-        if not hasattr(cls, "__class_getitem__"):
-            cls.__class_getitem__ = classmethod(class_getitem)  # type: ignore[attr-defined]
+        cls.__class_getitem__ = classmethod(class_getitem)  # type: ignore[attr-defined]
diff --git a/modeltranslation/tests/settings.py b/modeltranslation/tests/settings.py
index c408918b..5a617579 100644
--- a/modeltranslation/tests/settings.py
+++ b/modeltranslation/tests/settings.py
@@ -2,9 +2,11 @@
 import warnings
 
 import django_stubs_ext
+from modeltranslation._typing import monkeypatch
 
 warnings.simplefilter("always", DeprecationWarning)
 django_stubs_ext.monkeypatch()
+monkeypatch()
 
 
 def _get_database_config():
diff --git a/modeltranslation/tests/tests.py b/modeltranslation/tests/tests.py
index 00ae98e4..de5b46f5 100644
--- a/modeltranslation/tests/tests.py
+++ b/modeltranslation/tests/tests.py
@@ -2912,11 +2912,13 @@ class ProxyTestModelAdmin(admin.TranslationAdmin):
         assert tuple(ma.get_form(request, self.test_obj).base_fields.keys()) == tuple(fields)
 
     def test_class_attribute_access_raises_type_error(self):
+        # Test for django-cms compatibility
+        # https://github.com/django-cms/django-cms/issues/7948
         class TestModelAdmin(admin.TranslationAdmin[models.TestModel]):
             allow_children = True
 
         with pytest.raises(KeyError):
-            TestModelAdmin["allow_children"]  # type: ignore
+            TestModelAdmin["allow_children"]
 
 
 class ThirdPartyAppIntegrationTest(ModeltranslationTestBase):