diff --git a/src/Illuminate/Foundation/Providers/ArtisanServiceProvider.php b/src/Illuminate/Foundation/Providers/ArtisanServiceProvider.php
index 3eccb5d7e85d..d2ae86019342 100755
--- a/src/Illuminate/Foundation/Providers/ArtisanServiceProvider.php
+++ b/src/Illuminate/Foundation/Providers/ArtisanServiceProvider.php
@@ -409,7 +409,7 @@ protected function registerConfigMakeCommand()
      */
     protected function registerConfigPublishCommand()
     {
-        $this->app->singleton(ConfigPublishCommand::class, function ($app) {
+        $this->app->singleton(ConfigPublishCommand::class, function () {
             return new ConfigPublishCommand;
         });
     }