diff --git a/synapse/visibility.py b/synapse/visibility.py
index 7b037eeb0..dffe943b2 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -44,7 +44,11 @@ MEMBERSHIP_PRIORITY = (
 
 @defer.inlineCallbacks
 def filter_events_for_client(
-    storage: Storage, user_id, events, is_peeking=False, always_include_ids=frozenset(),
+    storage: Storage,
+    user_id,
+    events,
+    is_peeking=False,
+    always_include_ids=frozenset(),
     apply_retention_policies=True,
 ):
     """
@@ -96,9 +100,9 @@ def filter_events_for_client(
         retention_policies = {}
 
         for room_id in room_ids:
-            retention_policies[room_id] = (
-                yield storage.main.get_retention_policy_for_room(room_id)
-            )
+            retention_policies[
+                room_id
+            ] = yield storage.main.get_retention_policy_for_room(room_id)
 
     def allowed(event):
         """