1 files changed, 3 insertions, 4 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 5aa48230ec..204965afee 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1225,10 +1225,9 @@ class EventCreationHandler:
             )
 
         if prev_event_ids is not None:
-            assert (
-                len(prev_event_ids) <= 10
-            ), "Attempting to create an event with %i prev_events" % (
-                len(prev_event_ids),
+            assert len(prev_event_ids) <= 10, (
+                "Attempting to create an event with %i prev_events"
+                % (len(prev_event_ids),)
             )
         else:
             prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)