1 files changed, 5 insertions, 1 deletions
diff --git a/app/serializers/activitypub/undo_announce_serializer.rb b/app/serializers/activitypub/undo_announce_serializer.rb
index 839847e22..4fc042727 100644
--- a/app/serializers/activitypub/undo_announce_serializer.rb
+++ b/app/serializers/activitypub/undo_announce_serializer.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class ActivityPub::UndoAnnounceSerializer < ActiveModel::Serializer
-  attributes :id, :type, :actor
+  attributes :id, :type, :actor, :to
 
   has_one :object, serializer: ActivityPub::ActivitySerializer
 
@@ -16,4 +16,8 @@ class ActivityPub::UndoAnnounceSerializer < ActiveModel::Serializer
   def actor
     ActivityPub::TagManager.instance.uri_for(object.account)
   end
+
+  def to
+    [ActivityPub::TagManager::COLLECTIONS[:public]]
+  end
 end