Fixup

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/sliding_sync.py b/synapse/handlers/sliding_sync.py

index 6f2988e64c..c22a184efa 100644
--- a/synapse/handlers/sliding_sync.py
+++ b/synapse/handlers/sliding_sync.py
@@ -690,7 +690,7 @@ class SlidingSyncHandler:
         room_for_user_list = (
             await self.store.get_rooms_for_local_user_where_membership_is(
                 user_id=user_id,
-                membership_list=Membership.LIST,
+                membership_list=frozenset(Membership.LIST),
                 excluded_rooms=self.rooms_to_exclude_globally,
             )
         )