diff --git a/extensions/lock/src/Listener/SaveLockedToDatabase.php b/extensions/lock/src/Listener/SaveLockedToDatabase.php
index 664c81bc8..10a08252a 100755
--- a/extensions/lock/src/Listener/SaveLockedToDatabase.php
+++ b/extensions/lock/src/Listener/SaveLockedToDatabase.php
@@ -12,12 +12,9 @@ namespace Flarum\Lock\Listener;
 use Flarum\Discussion\Event\Saving;
 use Flarum\Lock\Event\DiscussionWasLocked;
 use Flarum\Lock\Event\DiscussionWasUnlocked;
-use Flarum\User\AssertPermissionTrait;
 
 class SaveLockedToDatabase
 {
-    use AssertPermissionTrait;
-
     public function handle(Saving $event)
     {
         if (isset($event->data['attributes']['isLocked'])) {
@@ -25,7 +22,7 @@ class SaveLockedToDatabase
             $discussion = $event->discussion;
             $actor = $event->actor;
 
-            $this->assertCan($actor, 'lock', $discussion);
+            $actor->assertCan('lock', $discussion);
 
             if ((bool) $discussion->is_locked === $isLocked) {
                 return;