1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 0e759b8a5d..060bbcb181 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -1928,6 +1928,6 @@ class RoomShutdownHandler:
         return {
             "kicked_users": kicked_users,
             "failed_to_kick_users": failed_to_kick_users,
-            "local_aliases": aliases_for_room,
+            "local_aliases": list(aliases_for_room),
             "new_room_id": new_room_id,
         }