diff --git a/src/Symfony/Component/Debug/DebugClassLoader.php b/src/Symfony/Component/Debug/DebugClassLoader.php
index 9ceac9af162b..b63c6adee954 100644
--- a/src/Symfony/Component/Debug/DebugClassLoader.php
+++ b/src/Symfony/Component/Debug/DebugClassLoader.php
@@ -149,11 +149,11 @@ public function loadClass($class)
                 if (!$file = $this->classLoader[0]->findFile($class) ?: false) {
                     // no-op
                 } elseif (\function_exists('opcache_is_script_cached') && @opcache_is_script_cached($file)) {
-                    require $file;
+                    include $file;
 
                     return;
                 } else {
-                    require $file;
+                    include $file;
                 }
             } else {
                 \call_user_func($this->classLoader, $class);