diff --git a/app/assets/javascripts/app/controllers/widget/online_notification.coffee b/app/assets/javascripts/app/controllers/widget/online_notification.coffee
index dba5a50a7..386a13c45 100644
--- a/app/assets/javascripts/app/controllers/widget/online_notification.coffee
+++ b/app/assets/javascripts/app/controllers/widget/online_notification.coffee
@@ -113,7 +113,7 @@ class App.OnlineNotificationWidget extends App.Controller
       processData: true
     )
 
-  updateHeight: =>
+  updateHeight: ->
     # set height of notification popover
     notificationsContainer  = $('.js-notificationsContainer')
     heightApp               = $('#app').height()