1 files changed, 2 insertions, 6 deletions
diff --git a/synapse/storage/databases/main/purge_events.py b/synapse/storage/databases/main/purge_events.py
index 0836e4af49..41f4fe7f95 100644
--- a/synapse/storage/databases/main/purge_events.py
+++ b/synapse/storage/databases/main/purge_events.py
@@ -331,13 +331,9 @@ class PurgeEventsStore(StateGroupWorkerStore, SQLBaseStore):
         txn.executemany(
             """
             DELETE FROM event_auth_chain_links WHERE
-            (origin_chain_id = ? AND origin_sequence_number = ?) OR
-            (target_chain_id = ? AND target_sequence_number = ?)
+            origin_chain_id = ? AND origin_sequence_number = ?
             """,
-            (
-                (chain_id, seq_num, chain_id, seq_num)
-                for (chain_id, seq_num) in referenced_chain_id_tuples
-            ),
+            referenced_chain_id_tuples,
         )
 
         # Now we delete tables which lack an index on room_id but have one on event_id