diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 8d1211c..be9821d 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -826,6 +826,7 @@ protected function initializeRequestGlobals(Request $request) {
     global $base_url;
     // Set and derived from $base_url by this function.
     global $base_path, $base_root;
+    global $base_secure_url, $base_insecure_url;
 
     // @todo Refactor with the Symfony Request object.
     if (isset($base_url)) {
@@ -863,6 +864,8 @@ protected function initializeRequestGlobals(Request $request) {
         $base_path = '/';
       }
     }
+    $base_secure_url = str_replace('http://', 'https://', $base_url);
+    $base_insecure_url = str_replace('https://', 'http://', $base_url);
   }
 
   /**