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-rw-r--r--synapse/storage/databases/main/relations.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index ac9b96ab44..7c54ce0b2e 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -138,7 +138,7 @@ class RelationsWorkerStore(SQLBaseStore):
             if isinstance(txn.database_engine, PostgresEngine):
                 txn.execute_values(sql % ("?",), rows, fetch=False)
             else:
-                txn.execute_batch(sql % ("?, ?, ?, ?, ?",), rows)
+                txn.execute_batch(sql % ("(?, ?, ?, ?, ?)",), rows)
 
             # Mark the progress.
             self.db_pool.updates._background_update_progress_txn(