1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/storage/databases/main/deviceinbox.py b/synapse/storage/databases/main/deviceinbox.py

index 042d595ea0..0612b82b9b 100644
--- a/synapse/storage/databases/main/deviceinbox.py
+++ b/synapse/storage/databases/main/deviceinbox.py
@@ -1116,7 +1116,7 @@ class DeviceInboxBackgroundUpdateStore(SQLBaseStore):
 
             txn.execute(sql, (start, stop))
 
-            destinations = {d for d, in txn}
+            destinations = {d for (d,) in txn}
             to_remove = set()
             for d in destinations:
                 try: