diff --git a/core/lib/Drupal/Core/Routing/UrlGenerator.php b/core/lib/Drupal/Core/Routing/UrlGenerator.php
index a5684ff..09c2eb6 100644
--- a/core/lib/Drupal/Core/Routing/UrlGenerator.php
+++ b/core/lib/Drupal/Core/Routing/UrlGenerator.php
@@ -91,8 +91,10 @@ class UrlGenerator extends ProviderBasedGenerator implements UrlGeneratorInterfa
    *    The read only settings.
    * @param \Psr\Log\LoggerInterface $logger
    *   An optional logger for recording errors.
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   A request stack object.
    */
-  public function __construct(RouteProviderInterface $provider, OutboundPathProcessorInterface $path_processor, OutboundRouteProcessorInterface $route_processor, ConfigFactoryInterface $config, Settings $settings, LoggerInterface $logger = NULL, RequestStack $requestStack) {
+  public function __construct(RouteProviderInterface $provider, OutboundPathProcessorInterface $path_processor, OutboundRouteProcessorInterface $route_processor, ConfigFactoryInterface $config, Settings $settings, LoggerInterface $logger = NULL, RequestStack $request_stack) {
     parent::__construct($provider, $logger);
 
     $this->pathProcessor = $path_processor;
@@ -100,7 +102,7 @@ public function __construct(RouteProviderInterface $provider, OutboundPathProces
     $this->mixedModeSessions = $settings->get('mixed_mode_sessions', FALSE);
     $allowed_protocols = $config->get('system.filter')->get('protocols') ?: array('http', 'https');
     UrlHelper::setAllowedProtocols($allowed_protocols);
-    $this->requestStack = $requestStack;
+    $this->requestStack = $request_stack;
     $this->updateFromRequest();
   }