1 files changed, 4 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py
index 6821476ee0..cea5ac9a68 100644
--- a/synapse/storage/databases/main/receipts.py
+++ b/synapse/storage/databases/main/receipts.py
@@ -71,8 +71,10 @@ class ReceiptsWorkerStore(SQLBaseStore):
         )
 
     @cached(num_args=3)
-    def get_last_receipt_event_id_for_user(self, user_id, room_id, receipt_type):
-        return self.db_pool.simple_select_one_onecol(
+    async def get_last_receipt_event_id_for_user(
+        self, user_id: str, room_id: str, receipt_type: str
+    ) -> Optional[str]:
+        return await self.db_pool.simple_select_one_onecol(
             table="receipts_linearized",
             keyvalues={
                 "room_id": room_id,