diff --git a/bin/phpstan b/bin/phpstan
index d3007f7eff3..48c772f1a8a 100755
--- a/bin/phpstan
+++ b/bin/phpstan
@@ -25,7 +25,7 @@ use Symfony\Component\Console\Helper\ProgressBar;
 	define('__PHPSTAN_RUNNING__', true);
 
 	$devOrPharLoader = require_once __DIR__ . '/../vendor/autoload.php';
-	//require_once __DIR__ . '/../preload.php';
+	require_once __DIR__ . '/../preload.php';
 	$composer = ComposerHelper::getComposerConfig(getcwd());
 
 	if ($composer !== null) {