diff --git a/django-stubs/db/migrations/serializer.pyi b/django-stubs/db/migrations/serializer.pyi
index 99f332890..c05bec752 100644
--- a/django-stubs/db/migrations/serializer.pyi
+++ b/django-stubs/db/migrations/serializer.pyi
@@ -1,6 +1,8 @@
 from collections.abc import Callable
 from typing import Any
 
+FUNCTION_TYPES: tuple[type, ...]
+
 class BaseSerializer:
     value: Any
     def __init__(self, value: Any) -> None: ...
diff --git a/scripts/stubtest/allowlist_todo_django51.txt b/scripts/stubtest/allowlist_todo_django51.txt
index 345fb2789..e68f2ade3 100644
--- a/scripts/stubtest/allowlist_todo_django51.txt
+++ b/scripts/stubtest/allowlist_todo_django51.txt
@@ -190,7 +190,6 @@ django.db.migrations.operations.models.RenameModel.category
 django.db.migrations.operations.special.RunPython.category
 django.db.migrations.operations.special.RunSQL.category
 django.db.migrations.operations.special.SeparateDatabaseAndState.category
-django.db.migrations.serializer.FUNCTION_TYPES
 django.db.models.CharField.slice_expression
 django.db.models.CheckConstraint.__init__
 django.db.models.Field.slice_expression