diff --git a/synapse/events/builder.py b/synapse/events/builder.py
index 14ea0e6640..1165c017ba 100644
--- a/synapse/events/builder.py
+++ b/synapse/events/builder.py
@@ -12,7 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
-from typing import TYPE_CHECKING, Any, Collection, Dict, List, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
import attr
from signedjson.types import SigningKey
@@ -28,7 +28,7 @@ from synapse.event_auth import auth_types_for_event
from synapse.events import EventBase, _EventInternalMetadata, make_event_from_dict
from synapse.state import StateHandler
from synapse.storage.databases.main import DataStore
-from synapse.types import EventID, JsonDict
+from synapse.types import EventID, JsonDict, StrCollection
from synapse.types.state import StateFilter
from synapse.util import Clock
from synapse.util.stringutils import random_string
@@ -103,7 +103,7 @@ class EventBuilder:
async def build(
self,
- prev_event_ids: Collection[str],
+ prev_event_ids: StrCollection,
auth_event_ids: Optional[List[str]],
depth: Optional[int] = None,
) -> EventBase:
@@ -136,7 +136,7 @@ class EventBuilder:
format_version = self.room_version.event_format
# The types of auth/prev events changes between event versions.
- prev_events: Union[Collection[str], List[Tuple[str, Dict[str, str]]]]
+ prev_events: Union[StrCollection, List[Tuple[str, Dict[str, str]]]]
auth_events: Union[List[str], List[Tuple[str, Dict[str, str]]]]
if format_version == EventFormatVersions.ROOM_V1_V2:
auth_events = await self._store.add_event_hashes(auth_event_ids)
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