1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index f66880cbba..2b635d6ca0 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -79,6 +79,7 @@ UNIQUE_INDEX_BACKGROUND_UPDATES = {
     "device_lists_remote_extremeties": "device_lists_remote_extremeties_unique_idx",
     "device_lists_remote_cache": "device_lists_remote_cache_unique_idx",
     "event_search": "event_search_event_id_idx",
+    "device_lists_outbound_last_success": "device_lists_outbound_last_success_unique_idx",
 }