diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 0e2ae09..69faba0 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -591,6 +591,7 @@ function drupal_settings_initialize() {
   if (is_readable(DRUPAL_ROOT . '/' . $conf_path . '/settings.php')) {
     include_once DRUPAL_ROOT . '/' . $conf_path . '/settings.php';
   }
+  require_once __DIR__ . '../../lib/Drupal/Component/Utility/Settings.php';
 
   new Settings(isset($settings) ? $settings : array());
   $is_https = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';
@@ -2751,6 +2752,7 @@ function drupal_classloader($class_loader = NULL) {
       $class_loader = settings()->get('class_loader', 'default');
     }
     if ($class_loader === 'apc') {
+      require_once __DIR__ . '/../vendor/symfony/class-loader/Symfony/Component/Classloader/ApcClassLoader.php';
       $apc_loader = new ApcClassLoader('drupal.' . drupal_get_hash_salt(), $loader);
       $loader->unregister();
       $apc_loader->register();