1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/state/__init__.py b/synapse/state/__init__.py
index 98a0239759..1605411b00 100644
--- a/synapse/state/__init__.py
+++ b/synapse/state/__init__.py
@@ -247,7 +247,7 @@ class StateHandler:
         return await self.get_hosts_in_room_at_events(room_id, event_ids)
 
     async def get_hosts_in_room_at_events(
-        self, room_id: str, event_ids: List[str]
+        self, room_id: str, event_ids: Iterable[str]
     ) -> Set[str]:
         """Get the hosts that were in a room at the given event ids