diff --git a/app/serializers/activitypub/note_serializer.rb b/app/serializers/activitypub/note_serializer.rb
index 67f596e78a..7225b23192 100644
--- a/app/serializers/activitypub/note_serializer.rb
+++ b/app/serializers/activitypub/note_serializer.rb
@@ -25,6 +25,7 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
   attribute :closed, if: :poll_and_expired?
 
   def id
+    raise Mastodon::NotPermittedError, 'Local-only statuses should not be serialized' if object.local_only?
     ActivityPub::TagManager.instance.uri_for(object)
   end