diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 5eb61e778..f27fe2512 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -10,10 +10,4 @@
  * file that was distributed with this source code.
  */
 
-require __DIR__.'/../src/Composer/Autoload/ClassLoader.php';
-
-$loader = new Composer\Autoload\ClassLoader();
-$loader->add('Composer\\', dirname(__DIR__).'/src/');
-$loader->add('Symfony\\Component\\', dirname(__DIR__).'/src/');
-$loader->add('Composer_', dirname(__DIR__).'/src/');
-$loader->register();
+require __DIR__.'/../vendor/.composer/autoload.php';