1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/relations.py b/synapse/handlers/relations.py
index 72d25df8c8..28d7093f08 100644
--- a/synapse/handlers/relations.py
+++ b/synapse/handlers/relations.py
@@ -103,7 +103,7 @@ class RelationsHandler:
 
         # TODO Properly handle a user leaving a room.
         (_, member_event_id) = await self._auth.check_user_in_room_or_world_readable(
-            room_id, user_id, allow_departed_users=True
+            room_id, requester, allow_departed_users=True
         )
 
         # This gets the original event and checks that a) the event exists and