diff --git a/core/modules/system/lib/Drupal/system/Controller/SystemController.php b/core/modules/system/lib/Drupal/system/Controller/SystemController.php
index b261f19..c28fe22 100644
--- a/core/modules/system/lib/Drupal/system/Controller/SystemController.php
+++ b/core/modules/system/lib/Drupal/system/Controller/SystemController.php
@@ -112,7 +112,7 @@ public function autocomplete($plugin_id, Request $request) {
    *
    * @return \Symfony\Component\HttpFoundation\RedirectResponse
    */
-  function compactPage($mode) {
+  public function compactPage($mode) {
     user_cookie_save(array('admin_compact_mode' => ($mode == 'on')));
     return new RedirectResponse(url('<front>', array('absolute' => TRUE)));
   }