diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index cbcfacad90..fc036c4dfa 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -358,10 +358,7 @@ class SyncRestServlet(RestServlet):
         joined = {}
         for room in rooms:
             joined[room.room_id] = await self.encode_room(
-                room,
-                time_now,
-                joined=True,
-                serialize_options=serialize_options,
+                room, time_now, joined=True, serialize_options=serialize_options,
             )
 
         return joined
@@ -466,10 +463,7 @@ class SyncRestServlet(RestServlet):
         joined = {}
         for room in rooms:
             joined[room.room_id] = await self.encode_room(
-                room,
-                time_now,
-                joined=False,
-                serialize_options=serialize_options,
+                room, time_now, joined=False, serialize_options=serialize_options,
             )
 
         return joined