diff --git a/core/lib/Drupal/Core/Routing/NullGenerator.php b/core/lib/Drupal/Core/Routing/NullGenerator.php
index 8154e14..f2e47f0 100644
--- a/core/lib/Drupal/Core/Routing/NullGenerator.php
+++ b/core/lib/Drupal/Core/Routing/NullGenerator.php
@@ -10,6 +10,7 @@
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Routing\RequestContext as SymfonyRequestContext;
 use Symfony\Component\Routing\Exception\RouteNotFoundException;
+use Symfony\Component\Routing\Route as SymfonyRoute;
 
 /**
  * No-op implementation of a Url Generator, needed for backward compatibility.
@@ -43,13 +44,13 @@ protected function getRoute($name) {
   /**
    * {@inheritdoc}
    */
-  protected function processRoute($name, Route $route, array &$parameters) {
+  protected function processRoute($name, SymfonyRoute $route, array &$parameters) {
   }
 
   /**
    * {@inheritdoc}
    */
-  protected function getInternalPathFromRoute(Route $route, $parameters = array()) {
+  protected function getInternalPathFromRoute(SymfonyRoute $route, $parameters = array()) {
     return $route->getPath();
   }