diff --git a/core/lib/Drupal/Core/EventSubscriber/LegacyRequestSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/LegacyRequestSubscriber.php
index d7ee895..e1686b4 100644
--- a/core/lib/Drupal/Core/EventSubscriber/LegacyRequestSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/LegacyRequestSubscriber.php
@@ -37,6 +37,16 @@ public function onKernelRequestLegacy(GetResponseEvent $event) {
   }
 
   /**
+   * Initializes the theme system after the routing system.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
+   *   The Event to process.
+   */
+  public function onKernelRequestLegacyAfterRouting(GetResponseEvent $event) {
+    drupal_theme_initialize();
+  }
+
+  /**
    * Registers the methods in this class that should be listeners.
    *
    * @return array
@@ -44,6 +54,7 @@ public function onKernelRequestLegacy(GetResponseEvent $event) {
    */
   static function getSubscribedEvents() {
     $events[KernelEvents::REQUEST][] = array('onKernelRequestLegacy', 90);
+    $events[KernelEvents::REQUEST][] = array('onKernelRequestLegacyAfterRouting', 30);
 
     return $events;
   }