diff --git a/synapse/handlers/initial_sync.py b/synapse/handlers/initial_sync.py
index 56c16ba469..56d0f267f7 100644
--- a/synapse/handlers/initial_sync.py
+++ b/synapse/handlers/initial_sync.py
@@ -186,7 +186,7 @@ class InitialSyncHandler:
 
                 invite_event = await self.store.get_event(event.event_id)
                 d["invite"] = await self._event_serializer.serialize_event(
-                    FilteredEvent(event=invite_event, membership=None),
+                    FilteredEvent.state(event=invite_event),
                     time_now,
                     config=serializer_options,
                 )
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index 969e069f5e..fc9319da4b 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -448,7 +448,7 @@ class SyncRestServlet(RestServlet):
         invited = {}
         for room in rooms:
             invite = await self._event_serializer.serialize_event(
-                FilteredEvent(event=room.invite, membership=None),
+                FilteredEvent.state(event=room.invite),
                 time_now,
                 config=serialize_options,
             )
@@ -486,7 +486,7 @@ class SyncRestServlet(RestServlet):
         knocked = {}
         for room in rooms:
             knock = await self._event_serializer.serialize_event(
-                FilteredEvent(event=room.knock, membership=None),
+                FilteredEvent.state(event=room.knock),
                 time_now,
                 config=serialize_options,
             )