diff -u b/core/lib/Drupal/Core/Render/Element/SystemCompactLink.php b/core/lib/Drupal/Core/Render/Element/SystemCompactLink.php
--- b/core/lib/Drupal/Core/Render/Element/SystemCompactLink.php
+++ b/core/lib/Drupal/Core/Render/Element/SystemCompactLink.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Core\Render\Element;
 
+use Drupal\Core\Url as BaseUrl;
 use Drupal\Component\Utility\NestedArray;
 
 /**
@@ -59,7 +60,7 @@
 
     if (system_admin_compact_mode()) {
       $element['#title'] = \Drupal::translation()->translate('Show descriptions');
-      $element['#url'] = \Drupal::url('system.admin_compact_page', array('mode' => 'off'));
+      $element['#url'] = BaseUrl::fromRoute('system.admin_compact_page', array('mode' => 'off'));
       $element['#options'] = array(
         'attributes' => array('title' => \Drupal::translation()->translate('Expand layout to include descriptions.')),
         'query' => drupal_get_destination(),
@@ -67,7 +68,7 @@
     }
     else {
       $element['#title'] = \Drupal::translation()->translate('Hide descriptions');
-      $element['#url'] = \Drupal::url('system.admin_compact_page', array('mode' => 'on'));
+      $element['#url'] = BaseUrl::fromRoute('system.admin_compact_page', array('mode' => 'on'));
       $element['#options'] = array(
         'attributes' => array('title' => \Drupal::translation()->translate('Compress layout by hiding descriptions.')),
         'query' => drupal_get_destination(),