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-rw-r--r--synapse/push/pusherpool.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/push/pusherpool.py b/synapse/push/pusherpool.py
index b9dca5bc63..01789a9fb4 100644
--- a/synapse/push/pusherpool.py
+++ b/synapse/push/pusherpool.py
@@ -191,7 +191,7 @@ class PusherPool:
                 min_stream_id - 1, max_stream_id
             )
             # This returns a tuple, user_id is at index 3
-            users_affected = set([r[3] for r in updated_receipts])
+            users_affected = {r[3] for r in updated_receipts}
 
             for u in users_affected:
                 if u in self.pushers: