diff --git a/tests/handlers/test_register.py b/tests/handlers/test_register.py
index 82f24ab1bc..84d89b3c54 100644
--- a/tests/handlers/test_register.py
+++ b/tests/handlers/test_register.py
@@ -194,6 +194,7 @@ class RegistrationTestCase(unittest.TestCase):
         with self.assertRaises(SynapseError):
             yield directory_handler.get_association(room_alias)
 
+    @defer.inlineCallbacks
     def test_auto_create_auto_join_where_no_consent(self):
         self.hs.config.user_consent_at_registration = True
         self.hs.config.block_events_without_consent_error = "Error"