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-rw-r--r--synapse/storage/databases/main/events_forward_extremities.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/events_forward_extremities.py b/synapse/storage/databases/main/events_forward_extremities.py
index 6b8da52fee..83f751cf5b 100644
--- a/synapse/storage/databases/main/events_forward_extremities.py
+++ b/synapse/storage/databases/main/events_forward_extremities.py
@@ -42,7 +42,7 @@ class EventForwardExtremitiesStore(SQLBaseStore):
                     room_id,
                 )
             except KeyError:
-                msg = f"No forward extremity event found for room {room_id}"
+                msg = "No forward extremity event found for room %s" % room_id
                 logger.warning(msg)
                 raise SynapseError(400, msg)