1 files changed, 5 insertions, 4 deletions
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py
index 56818f4df8..0db900fa0e 100644
--- a/synapse/storage/background_updates.py
+++ b/synapse/storage/background_updates.py
@@ -414,13 +414,14 @@ class BackgroundUpdater(object):
 
         self.register_background_update_handler(update_name, updater)
 
-    def _end_background_update(self, update_name):
+    async def _end_background_update(self, update_name: str) -> None:
         """Removes a completed background update task from the queue.
 
         Args:
-            update_name(str): The name of the completed task to remove
+            update_name:: The name of the completed task to remove
+
         Returns:
-            A deferred that completes once the task is removed.
+            None, completes once the task is removed.
         """
         if update_name != self._current_background_update:
             raise Exception(
@@ -428,7 +429,7 @@ class BackgroundUpdater(object):
                 % update_name
             )
         self._current_background_update = None
-        return self.db_pool.simple_delete_one(
+        await self.db_pool.simple_delete_one(
             "background_updates", keyvalues={"update_name": update_name}
         )