1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 95a244d86c..1edc657f8a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -213,7 +213,7 @@ class RoomMemberHandler(object):
 
             if predecessor:
                 # It is an upgraded room. Copy over old tags
-                self.copy_room_tags_and_direct_to_room(
+                yield self.copy_room_tags_and_direct_to_room(
                     predecessor["room_id"], room_id, user_id
                 )
                 # Copy over push rules