diff --git a/changelog.d/15429.misc b/changelog.d/15429.misc
new file mode 100644
index 0000000000..c5b054d19e
--- /dev/null
+++ b/changelog.d/15429.misc
@@ -0,0 +1 @@
+Improve DB performance of clearing out old data from `stream_ordering_to_exterm`.
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 9e6011e8ea..2ad6fa7d5e 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -1708,7 +1708,7 @@ class EventFederationWorkerStore(SignatureWorkerStore, EventsWorkerStore, SQLBas
                 WHERE stream_ordering < ?
             """
             txn.execute(
-                sql, (self.stream_ordering_month_ago)  # type: ignore[attr-defined]
+                sql, (self.stream_ordering_month_ago,)  # type: ignore[attr-defined]
             )
 
         await self.db_pool.runInteraction(