diff --git a/src/Symfony/Component/Debug/DebugClassLoader.php b/src/Symfony/Component/Debug/DebugClassLoader.php
index b63c6adee954c..13ab9e700c743 100644
--- a/src/Symfony/Component/Debug/DebugClassLoader.php
+++ b/src/Symfony/Component/Debug/DebugClassLoader.php
@@ -152,8 +152,8 @@ public function loadClass($class)
                     include $file;
 
                     return;
-                } else {
-                    include $file;
+                } elseif (false === include $file) {
+                    return;
                 }
             } else {
                 \call_user_func($this->classLoader, $class);