diff --git a/framework/core/src/Admin/AdminServiceProvider.php b/framework/core/src/Admin/AdminServiceProvider.php
index 834d95b73..3302b78f4 100644
--- a/framework/core/src/Admin/AdminServiceProvider.php
+++ b/framework/core/src/Admin/AdminServiceProvider.php
@@ -30,8 +30,8 @@ class AdminServiceProvider extends ServiceProvider
      */
     public function register()
     {
-        $this->app['flarum.admin.assetManager'] = $this->app->share(function ($app) {
-            return new AssetManager($app['files'], $app['path.public'].'/assets', 'admin');
+        $this->app->singleton('flarum.admin.assetManager', function () {
+            return new AssetManager($this->app->make('files'), public_path('assets'), 'admin');
         });
     }
 }