diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index e842134..43acb73 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -1047,8 +1047,8 @@ function node_view_multiple($nodes, $view_mode = 'teaser', $langcode = NULL) {
  */
 function node_page_build(&$page) {
   // Add 'Back to content edit editing' link on preview page.
-  $attributes = \Drupal::request()->attributes;
-  if ($attributes->get(RouteObjectInterface::ROUTE_NAME) == 'node.preview') {
+  $route_match = \Drupal::routeMatch();
+  if ($route_match->getRouteName() == 'node.preview') {
     $page['page_top']['node_preview'] = array(
       '#type' => 'container',
       '#attributes' => array(
@@ -1056,7 +1056,7 @@ function node_page_build(&$page) {
       ),
     );
 
-    $form = \Drupal::formBuilder()->getForm('\Drupal\node\Form\NodePreviewForm', $attributes->get('node_preview'));
+    $form = \Drupal::formBuilder()->getForm('\Drupal\node\Form\NodePreviewForm', $route_match->getParameter('node_preview'));
     $page['page_top']['node_preview']['view_mode'] = $form;
   }
 }