diff --git a/extensions/pusher/extend.php b/extensions/pusher/extend.php
index 4111d53f9..e7802a6a8 100644
--- a/extensions/pusher/extend.php
+++ b/extensions/pusher/extend.php
@@ -9,6 +9,7 @@
  * file that was distributed with this source code.
  */
 
+use Flarum\Api\Event\Serializing;
 use Flarum\Extend;
 use Flarum\Pusher\Api\Controller\AuthController;
 use Flarum\Pusher\Listener;
@@ -26,7 +27,7 @@ return [
         ->post('/pusher/auth', 'pusher.auth', AuthController::class),
 
     function (Dispatcher $events) {
-        $events->subscribe(Listener\AddPusherApi::class);
+        $events->listen(Serializing::class, Listener\AddPusherApi::class);
         $events->subscribe(Listener\PushNewPosts::class);
     },
 ];
diff --git a/extensions/pusher/src/Listener/AddPusherApi.php b/extensions/pusher/src/Listener/AddPusherApi.php
index 27a8d014d..897019f12 100755
--- a/extensions/pusher/src/Listener/AddPusherApi.php
+++ b/extensions/pusher/src/Listener/AddPusherApi.php
@@ -14,7 +14,6 @@ namespace Flarum\Pusher\Listener;
 use Flarum\Api\Event\Serializing;
 use Flarum\Api\Serializer\ForumSerializer;
 use Flarum\Settings\SettingsRepositoryInterface;
-use Illuminate\Contracts\Events\Dispatcher;
 
 class AddPusherApi
 {
@@ -31,18 +30,7 @@ class AddPusherApi
         $this->settings = $settings;
     }
 
-    /**
-     * @param Dispatcher $events
-     */
-    public function subscribe(Dispatcher $events)
-    {
-        $events->listen(Serializing::class, [$this, 'addAttributes']);
-    }
-
-    /**
-     * @param Serializing $event
-     */
-    public function addAttributes(Serializing $event)
+    public function handle(Serializing $event)
     {
         if ($event->isSerializer(ForumSerializer::class)) {
             $event->attributes['pusherKey'] = $this->settings->get('flarum-pusher.app_key');