diff --git a/tests/storage/test_redaction.py b/tests/storage/test_redaction.py
index f0e86d41a8c90087b5ebb21ca04238e79119593d..deecfad9fb50a11d2fccabf30f77947e835c5f28 100644
--- a/tests/storage/test_redaction.py
+++ b/tests/storage/test_redaction.py
@@ -31,8 +31,10 @@ from tests.utils import create_room
 
 class RedactionTestCase(unittest.HomeserverTestCase):
     def make_homeserver(self, reactor, clock):
+        config = self.default_config()
+        config["redaction_retention_period"] = "30d"
         return self.setup_test_homeserver(
-            resource_for_federation=Mock(), http_client=None
+            resource_for_federation=Mock(), http_client=None, config=config
         )
 
     def prepare(self, reactor, clock, hs):