diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index 4e80798..5cd0004 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -8,6 +8,13 @@ backbone:
   dependencies:
     - core/underscore
 
+classList:
+  remote: https://github.com/eligrey/classList.js
+  # @todo Stable release required for Drupal 8.0.
+  version: master
+  js:
+    assets/vendor/classList/classList.min.js: { weight: -21, browsers: { IE: 'lte IE 9', '!IE': false } }
+
 ckeditor:
   remote: https://github.com/ckeditor/ckeditor-dev
   # @todo Stable release required for Drupal 8.0.
@@ -34,6 +41,15 @@ drupalSettings:
   version: VERSION
   settings: {}
 
+drupal.active-link:
+  version: VERSION
+  js:
+    misc/active-link.js: {}
+  dependencies:
+    - core/drupal
+    - core/drupalSettings
+    - core/classList
+
 drupal.ajax:
   version: VERSION
   js:
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 93fdadb..12f0514 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1319,7 +1319,7 @@ function system_page_build(&$page) {
   // @see theme_links()
   // @see \Drupal\system\Controller\SystemController::setLinkActiveClass
   if (\Drupal::currentUser()->isAuthenticated()) {
-    $page['#attached']['library'][] = array('system', 'drupal.active-link');
+    $page['#attached']['library'][] = array('core', 'drupal.active-link');
   }
   else {
     $page['#post_render_cache']['\Drupal\system\Controller\SystemController::setLinkActiveClass'] = array(