1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 2bf0ebd025..2fc8264858 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -1284,8 +1284,11 @@ class RoomContextHandler:
         before_limit = math.floor(limit / 2.0)
         after_limit = limit - before_limit
 
-        users = await self.store.get_users_in_room(room_id)
-        is_peeking = user.to_string() not in users
+        is_user_in_room = await self.store.check_local_user_in_room(
+            user_id=user.to_string(), room_id=room_id
+        )
+        # The user is peeking if they aren't in the room already
+        is_peeking = not is_user_in_room
 
         async def filter_evts(events: List[EventBase]) -> List[EventBase]:
             if use_admin_priviledge: