diff --git a/core/lib/Drupal/Core/Template/TwigNodeVisitor.php b/core/lib/Drupal/Core/Template/TwigNodeVisitor.php
index 05346aa..860cc56 100644
--- a/core/lib/Drupal/Core/Template/TwigNodeVisitor.php
+++ b/core/lib/Drupal/Core/Template/TwigNodeVisitor.php
@@ -21,14 +21,14 @@ class TwigNodeVisitor extends \Twig_BaseNodeVisitor {
   /**
    * {@inheritdoc}
    */
-  public function doEnterNode(\Twig_Node $node, \Twig_Environment $env) {
+  protected function doEnterNode(\Twig_Node $node, \Twig_Environment $env) {
     return $node;
   }
 
   /**
    * {@inheritdoc}
    */
-  public function doLeaveNode(\Twig_Node $node, \Twig_Environment $env) {
+  protected function doLeaveNode(\Twig_Node $node, \Twig_Environment $env) {
     // We use this to inject a call to render_var -> TwigExtension->renderVar()
     // before anything is printed.
     if ($node instanceof \Twig_Node_Print) {