diff --git a/src/Illuminate/Foundation/Bootstrap/DetectEnvironment.php b/src/Illuminate/Foundation/Bootstrap/DetectEnvironment.php
index 03914738d960..5fa8ea08013b 100644
--- a/src/Illuminate/Foundation/Bootstrap/DetectEnvironment.php
+++ b/src/Illuminate/Foundation/Bootstrap/DetectEnvironment.php
@@ -35,6 +35,10 @@ public function bootstrap(Application $app)
      */
     protected function checkForSpecificEnvironmentFile($app)
     {
+        if ($env = $app->detectEnvironment(function () {})) {
+            putenv('APP_ENV='.$env);
+        }
+
         if (! env('APP_ENV')) {
             return;
         }