diff --git a/tests/fields/fields.py b/tests/fields/fields.py
index 52817479..3fc218fa 100644
--- a/tests/fields/fields.py
+++ b/tests/fields/fields.py
@@ -1929,7 +1929,7 @@ class FieldTest(unittest.TestCase):
 
         user = User.objects(bookmarks__all=[post_1]).first()
 
-        self.assertIsNotNone(user)
+        self.assertNotEqual(user, None)
         self.assertEqual(user.bookmarks[0], post_1)
 
         Post.drop_collection()