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-rw-r--r--synapse/storage/databases/main/event_federation.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 10184d6ae7..ba9f71a230 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -906,7 +906,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
             desc="get_latest_event_ids_in_room",
         )
 
-    async def get_min_depth(self, room_id: str) -> int:
+    async def get_min_depth(self, room_id: str) -> Optional[int]:
         """For the given room, get the minimum depth we have seen for it."""
         return await self.db_pool.runInteraction(
             "get_min_depth", self._get_min_depth_interaction, room_id