diff --git a/resources/assets/scripts/app/services/focus.coffee b/resources/assets/scripts/app/services/focus.coffee
index 9e12f233..63033c38 100644
--- a/resources/assets/scripts/app/services/focus.coffee
+++ b/resources/assets/scripts/app/services/focus.coffee
@@ -19,8 +19,9 @@
 # using a jQuery selector.
 #
 # Based on: https://stackoverflow.com/a/25597540/3225811
-angular.module('ponyfm').factory 'focus', ($timeout, $window) ->
+angular.module('ponyfm').factory('focus', ['$timeout', '$window', ($timeout, $window) ->
     (selector) ->
         $timeout () ->
             element = $window.jQuery("#{selector}")
             element.focus() # will do nothing if the selector doesn't select anything
+])