diff --git a/src/Symfony/Component/Dotenv/Dotenv.php b/src/Symfony/Component/Dotenv/Dotenv.php
index 5c41d81d96..613d9f8246 100644
--- a/src/Symfony/Component/Dotenv/Dotenv.php
+++ b/src/Symfony/Component/Dotenv/Dotenv.php
@@ -35,7 +35,7 @@ final class Dotenv
     private $data;
     private $end;
     private $values;
-    private $usePutenv = true;
+    private $usePutenv;
 
     /**
      * @var bool If `putenv()` should be used to define environment variables or not.