diff --git a/synapse/replication/slave/storage/directory.py b/synapse/replication/slave/storage/directory.py
index 5fbe3a303..7301d885f 100644
--- a/synapse/replication/slave/storage/directory.py
+++ b/synapse/replication/slave/storage/directory.py
@@ -20,4 +20,4 @@ from synapse.storage.directory import DirectoryStore
 class DirectoryStore(BaseSlavedStore):
     get_aliases_for_room = DirectoryStore.__dict__[
         "get_aliases_for_room"
-    ].orig
+    ]