diff --git a/autoload.php b/autoload.php
index 690e09f..caedb48 100644
--- a/autoload.php
+++ b/autoload.php
@@ -16,4 +16,4 @@
  * @see core/modules/statistics/statistics.php
  */
 
-return require_once __DIR__ . '/core/vendor/autoload.php';
+return require __DIR__ . '/core/vendor/autoload.php';
diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 7e33986..b78fd9d 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -98,7 +98,7 @@ function install_drupal($class_loader, $settings = array()) {
   //   infrastructure in https://www.drupal.org/node/2389243
   if (is_array($class_loader) && $settings === array()) {
     $settings = $class_loader;
-    $class_loader = require __DIR__ . '/../vendor/autoload.php';
+    $class_loader = require __DIR__ . '/../../autoload.php';
   }
 
   global $install_state;