1 files changed, 3 insertions, 3 deletions
diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index 8c8ff18a1a..1fe6567185 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-from typing import TYPE_CHECKING, Collection, Dict, List, Optional, Set
+from typing import TYPE_CHECKING, Dict, List, Optional, Set
 
 import attr
 
@@ -28,7 +28,7 @@ from synapse.logging.opentracing import trace
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.rest.admin._base import assert_user_is_admin
 from synapse.streams.config import PaginationConfig
-from synapse.types import JsonDict, Requester, StreamKeyType
+from synapse.types import JsonDict, Requester, StrCollection, StreamKeyType
 from synapse.types.state import StateFilter
 from synapse.util.async_helpers import ReadWriteLock
 from synapse.util.stringutils import random_string
@@ -391,7 +391,7 @@ class PaginationHandler:
         """
         return self._delete_by_id.get(delete_id)
 
-    def get_delete_ids_by_room(self, room_id: str) -> Optional[Collection[str]]:
+    def get_delete_ids_by_room(self, room_id: str) -> Optional[StrCollection]:
         """Get all active delete ids by room
 
         Args: