diff --git a/test/web/activity_pub/transmogrifier_test.exs b/test/web/activity_pub/transmogrifier_test.exs
index 1069ade02..4df3024a6 100644
--- a/test/web/activity_pub/transmogrifier_test.exs
+++ b/test/web/activity_pub/transmogrifier_test.exs
@@ -1102,7 +1102,7 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       message = %{
         "@context" => "https://www.w3.org/ns/activitystreams",
         "cc" => [user.ap_id],
-        "object" => [user.ap_id, activity],
+        "object" => [user.ap_id, activity.data["id"]],
         "type" => "Flag",
         "content" => "blocked AND reported!!!",
         "actor" => other_user.ap_id