diff --git a/config/app.php b/config/app.php
index 1941d7c7296..7c60cd9defe 100644
--- a/config/app.php
+++ b/config/app.php
@@ -56,7 +56,7 @@
 
     'url' => env('APP_URL', 'http://localhost'),
 
-    'asset_url' => env('ASSET_URL', null),
+    'asset_url' => env('ASSET_URL'),
 
     /*
     |--------------------------------------------------------------------------