diff --git a/addons/mail/static/tests/chatter_tests.js b/addons/mail/static/tests/chatter_tests.js
index ade3d5d795b..926b9f9828a 100644
--- a/addons/mail/static/tests/chatter_tests.js
+++ b/addons/mail/static/tests/chatter_tests.js
@@ -7,6 +7,7 @@ var core = require('web.core');
 var FormView = require('web.FormView');
 var KanbanView = require('web.KanbanView');
 var testUtils = require('web.test_utils');
+var concurrency = require('web.concurrency');
 
 var createView = testUtils.createView;