diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 32f69e0fa..45a030ca3 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -388,7 +388,7 @@ def flag(
       if forward do
         Map.merge(additional, %{"to" => [], "cc" => [account.ap_id]})
       else
-        additional
+        Map.merge(additional, %{"to" => [], "cc" => []})
       end
 
     with flag_data <- make_flag_data(params, additional),