diff --git a/src/Symfony/Component/Debug/ErrorHandler.php b/src/Symfony/Component/Debug/ErrorHandler.php
index 1240ee8df6..c6b71c36ab 100644
--- a/src/Symfony/Component/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/Debug/ErrorHandler.php
@@ -165,9 +165,6 @@ class ErrorHandler
 
                 return true;
             }
-            if (!class_exists('Symfony\Component\Debug\Exception\FlattenException')) {
-                require __DIR__.'/Exception/FlattenException.php';
-            }
 
             if (PHP_VERSION_ID < 50400 && isset($context['GLOBALS']) && is_array($context)) {
                 unset($context['GLOBALS']);