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-rw-r--r--synapse/storage/event_federation.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index 5fd126cdb9..4655c8e548 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -367,7 +367,7 @@ class EventFederationStore(SQLBaseStore):
         ).addCallback(
             self._get_events
         ).addCallback(
-            lambda l: l.sort(key=lambda e: -e.depth)
+            lambda l: sorted(l, key=lambda e: -e.depth)
         )
 
     def _get_backfill_events(self, txn, room_id, event_list, limit):