1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index ee11764567..9e9601d423 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -17,7 +17,6 @@ from typing import (
     TYPE_CHECKING,
     AbstractSet,
     Any,
-    Collection,
     Dict,
     FrozenSet,
     List,
@@ -62,6 +61,7 @@ from synapse.types import (
     Requester,
     RoomStreamToken,
     StateMap,
+    StrCollection,
     StreamKeyType,
     StreamToken,
     UserID,
@@ -1179,7 +1179,7 @@ class SyncHandler:
     async def _find_missing_partial_state_memberships(
         self,
         room_id: str,
-        members_to_fetch: Collection[str],
+        members_to_fetch: StrCollection,
         events_with_membership_auth: Mapping[str, EventBase],
         found_state_ids: StateMap[str],
     ) -> StateMap[str]: