diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index 4db7cd60f..0414d73d8 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -1061,7 +1061,7 @@ def render_notification(user, %{id: id, activity: activity, inserted_at: created
     response = %{
       id: to_string(id),
       type: mastodon_type,
-      created_at: CommonAPI.Utils.to_masto_date(activity.inserted_at),
+      created_at: CommonAPI.Utils.to_masto_date(created_at),
       account: AccountView.render("account.json", %{user: actor, for: user})
     }