diff --git a/tests/utils.py b/tests/utils.py
index ab2252d24..2d0bd205f 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -54,6 +54,7 @@ def setup_test_homeserver(name="test", datastore=None, config=None, **kargs):
         config.room_invite_state_types = []
         config.password_providers = []
         config.worker_replication_url = ""
+        config.worker_app = None
 
     config.use_frozen_dicts = True
     config.database_config = {"name": "sqlite3"}