diff --git a/synapse/replication/slave/storage/room.py b/synapse/replication/slave/storage/room.py
index 81743941dc9e..23c613863f43 100644
--- a/synapse/replication/slave/storage/room.py
+++ b/synapse/replication/slave/storage/room.py
@@ -38,6 +38,7 @@ def __init__(self, db_conn, hs):
     get_published_at_stream_id_txn = (
         DataStore.get_published_at_stream_id_txn.__func__
     )
+    get_public_room_changes = DataStore.get_public_room_changes.__func__
 
     def stream_positions(self):
         result = super(RoomStore, self).stream_positions()