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
@@ -57,7 +57,8 @@
 
     if (system_admin_compact_mode()) {
       $element['#title'] = t('Show descriptions');
-      $element['#href'] = 'admin/compact/off';
+      $element['#route_name'] = 'system.admin_compact_page';
+      $element['#route_parameters'] = array('mode' => 'off');
       $element['#options'] = array(
         'attributes' => array('title' => t('Expand layout to include descriptions.')),
         'query' => drupal_get_destination(),
@@ -65,7 +66,8 @@
     }
     else {
       $element['#title'] = t('Hide descriptions');
-      $element['#href'] = 'admin/compact/on';
+      $element['#route_name'] = 'system.admin_compact_page';
+      $element['#route_parameters'] = array('mode' => 'on');
       $element['#options'] = array(
         'attributes' => array('title' => t('Compress layout by hiding descriptions.')),
         'query' => drupal_get_destination(),