diff --git a/ember/app/adapters/application.js b/ember/app/adapters/application.js
index 595489cbd..8487c2565 100644
--- a/ember/app/adapters/application.js
+++ b/ember/app/adapters/application.js
@@ -31,7 +31,7 @@ export default JsonApiAdapter.extend({
       } else {
         message = errors.message;
       }
-      var alert = AlertMessage.create({
+      var alert = AlertMessage.extend({
         type: 'warning',
         message: message
       });
diff --git a/ember/app/controllers/alerts.js b/ember/app/controllers/alerts.js
index 1ce9f27f4..562f165ae 100644
--- a/ember/app/controllers/alerts.js
+++ b/ember/app/controllers/alerts.js
@@ -8,7 +8,7 @@ export default Ember.Controller.extend({
       this.get('alerts').pushObject(message);
     },
     dismissAlert: function(message) {
-      this.get('alerts').removeObject(message);
+      this.get('alerts').removeObject(message.constructor);
     },
     clearAlerts: function() {
       this.get('alerts').clear();
diff --git a/ember/app/routes/application.js b/ember/app/routes/application.js
index bf0e1ae78..47a3aa973 100644
--- a/ember/app/routes/application.js
+++ b/ember/app/routes/application.js
@@ -6,7 +6,7 @@ import AlertMessage from 'flarum/components/ui/alert-message';
 export default Ember.Route.extend(ApplicationRouteMixin, {
   activate: function() {
     if (!Ember.isEmpty(FLARUM_ALERT)) {
-      this.controllerFor('alerts').send('alert', AlertMessage.create(FLARUM_ALERT));
+      this.controllerFor('alerts').send('alert', AlertMessage.extend(FLARUM_ALERT));
       FLARUM_ALERT = null;
     }