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-rw-r--r--synapse/storage/events.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 77a0dcd3b8..0c870df3f7 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -1414,7 +1414,7 @@ class EventsStore(EventsWorkerStore):
         # Set of event_ids of all prev_events of those in `forward_events`. This
         # is guaranteed to contain at least the given event_id.
         sibling_events = set()
-        for eid in set(forward_events):
+        for eid in forward_events:
             chunk_id = self._simple_select_one_onecol_txn(
                 txn,
                 table="events",