1 files changed, 7 insertions, 1 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 87f671708c..95b4fad3c6 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -247,7 +247,13 @@ class MessageHandler:
                 room_state = room_state_events[membership_event_id]
 
         now = self.clock.time_msec()
-        events = await self._event_serializer.serialize_events(room_state.values(), now)
+        events = await self._event_serializer.serialize_events(
+            room_state.values(),
+            now,
+            # We don't bother bundling aggregations in when asked for state
+            # events, as clients won't use them.
+            bundle_relations=False,
+        )
         return events
 
     async def get_joined_members(self, requester: Requester, room_id: str) -> dict: