diff --git a/gnuviechadmin/osusers/tests/test_models.py b/gnuviechadmin/osusers/tests/test_models.py
index 572cfcb..7fe2736 100644
--- a/gnuviechadmin/osusers/tests/test_models.py
+++ b/gnuviechadmin/osusers/tests/test_models.py
@@ -78,7 +78,7 @@ class AdditionalGroupTest(TestCaseWithCeleryTasks):
 
 
 @override_settings(OSUSER_MINGID=10000)
-class GroupManagerTest(TestCase):
+class GroupManagerTest(TestCaseWithCeleryTasks):
     def test_get_next_gid_first(self):
         self.assertEqual(Group.objects.get_next_gid(), 10000)