diff --git a/bootstrap.php b/bootstrap.php
index f2ceffb1..f5f98054 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -20,10 +20,6 @@
 // Enforce a consistent locale
 setlocale(LC_ALL, 'C');
 
-if (!class_exists('Doctrine\Common\Annotations\AnnotationRegistry', false) && class_exists('Doctrine\Common\Annotations\AnnotationRegistry')) {
-    AnnotationRegistry::registerLoader('class_exists');
-}
-
 if ('disabled' !== getenv('SYMFONY_DEPRECATIONS_HELPER')) {
     DeprecationErrorHandler::register(getenv('SYMFONY_DEPRECATIONS_HELPER'));
 }