diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index befc7a0f3..1fd0c1fce 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -93,6 +93,7 @@ jobs:
           migrations
           model_fields
           model_forms
+          model_formsets
           model_inheritance_regress
           mutually_referential
           nested_foreign_keys
diff --git a/django_mongodb/fields/auto.py b/django_mongodb/fields/auto.py
index 34dc3a449..e77d898ff 100644
--- a/django_mongodb/fields/auto.py
+++ b/django_mongodb/fields/auto.py
@@ -40,11 +40,14 @@ def to_python(self, value):
         try:
             return ObjectId(value)
         except errors.InvalidId:
-            raise exceptions.ValidationError(
-                self.error_messages["invalid"],
-                code="invalid",
-                params={"value": value},
-            ) from None
+            try:
+                return int(value)
+            except ValueError:
+                raise exceptions.ValidationError(
+                    self.error_messages["invalid"],
+                    code="invalid",
+                    params={"value": value},
+                ) from None
 
     @cached_property
     def validators(self):
diff --git a/tests/model_fields_/__init__.py b/tests/model_fields_/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/model_fields_/test_autofield.py b/tests/model_fields_/test_autofield.py
new file mode 100644
index 000000000..6c4345c4e
--- /dev/null
+++ b/tests/model_fields_/test_autofield.py
@@ -0,0 +1,9 @@
+from django.test import SimpleTestCase
+
+from django_mongodb.fields import ObjectIdAutoField
+
+
+class MethodTests(SimpleTestCase):
+    def test_to_python(self):
+        f = ObjectIdAutoField()
+        self.assertEqual(f.to_python("1"), 1)