diff --git a/app/assets/javascripts/discourse/controllers/composer.js.es6 b/app/assets/javascripts/discourse/controllers/composer.js.es6
index bac746b3b..a52120b22 100644
--- a/app/assets/javascripts/discourse/controllers/composer.js.es6
+++ b/app/assets/javascripts/discourse/controllers/composer.js.es6
@@ -65,7 +65,7 @@ export default Ember.Controller.extend({
   init() {
     this._super();
 
-    addPopupMenuOptionsCallback(function() {
+    addPopupMenuOptionsCallback(() => {
       return {
         action: 'toggleWhisper',
         icon: 'eye-slash',
diff --git a/app/assets/javascripts/discourse/lib/plugin-api.js.es6 b/app/assets/javascripts/discourse/lib/plugin-api.js.es6
index c97573fb4..1ccc1c067 100644
--- a/app/assets/javascripts/discourse/lib/plugin-api.js.es6
+++ b/app/assets/javascripts/discourse/lib/plugin-api.js.es6
@@ -231,7 +231,7 @@ class PluginApi {
    * Example:
    *
    * ```
-   * api.addToolbarPopupMenuOptionsCallback(function() {
+   * api.addToolbarPopupMenuOptionsCallback(() => {
    *  return {
    *    action: 'toggleWhisper',
    *    icon: 'eye-slash',