diff --git a/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php b/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
index 1d26b960d220..fc6f8c9fb155 100644
--- a/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
+++ b/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
@@ -2,7 +2,6 @@
 
 namespace Illuminate\Foundation\Bootstrap;
 
-use Exception;
 use Illuminate\Config\Repository;
 use Illuminate\Contracts\Config\Repository as RepositoryContract;
 use Illuminate\Contracts\Foundation\Application;
@@ -62,12 +61,12 @@ protected function loadConfigurationFiles(Application $app, RepositoryContract $
     {
         $files = $this->getConfigurationFiles($app);
 
-        // if (! isset($files['app'])) {
-        //     throw new Exception('Unable to load the "app" configuration file.');
-        // }
-
         $base = $this->getBaseConfiguration();
 
+        foreach (array_diff(array_keys($base), array_keys($files)) as $name => $config) {
+            $repository->set($name, $config);
+        }
+
         foreach ($files as $name => $path) {
             $base = $this->loadConfigurationFile($repository, $name, $path, $base);
         }