diff --git a/addons/mail/static/tests/crosstab/crosstab_tests.js b/addons/mail/static/tests/crosstab/crosstab_tests.js
index 758e5049d8b..a9d5366d021 100644
--- a/addons/mail/static/tests/crosstab/crosstab_tests.js
+++ b/addons/mail/static/tests/crosstab/crosstab_tests.js
@@ -1,6 +1,7 @@
 /* @odoo-module */
 
 import { startServer } from "@bus/../tests/helpers/mock_python_environment";
+import { waitUntilSubscribe } from "@bus/../tests/helpers/websocket_event_deferred";
 
 import { start } from "@mail/../tests/helpers/test_utils";
 
@@ -122,7 +123,7 @@ QUnit.test("Channel subscription is renewed when channel is left", async (assert
     openDiscuss();
     await click(".o-mail-DiscussSidebarChannel .btn[title='Leave this channel']");
     await contains(".o-mail-DiscussSidebarChannel", { count: 0 });
-    await new Promise((resolve) => setTimeout(resolve)); // update of channels is debounced
+    await waitUntilSubscribe();
     assert.verifySteps(["update-channels"]);
 });