1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/roommember.py b/synapse/storage/databases/main/roommember.py
index 4d82c4c26d..68f1b40ea6 100644
--- a/synapse/storage/databases/main/roommember.py
+++ b/synapse/storage/databases/main/roommember.py
@@ -649,7 +649,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
             event_to_memberships = await self._get_joined_profiles_from_event_ids(
                 missing_member_event_ids
             )
-            users_in_room.update((row for row in event_to_memberships.values() if row))
+            users_in_room.update(row for row in event_to_memberships.values() if row)
 
         if event is not None and event.type == EventTypes.Member:
             if event.membership == Membership.JOIN: