diff --git a/core/lib/Drupal/Core/DependencyInjection/Compiler/StackedKernelPass.php b/core/lib/Drupal/Core/DependencyInjection/Compiler/StackedKernelPass.php
index b20db35..e5edb51 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Compiler/StackedKernelPass.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Compiler/StackedKernelPass.php
@@ -28,31 +28,37 @@ public function process(ContainerBuilder $container) {
       return;
     }
 
-    $previous_id = 'http_kernel';
-    $first = $http_kernel = $container->getDefinition('http_kernel');
-
-    $kernel_map = array();
+    $middlewares = array();
+    $priorities = array();
 
     foreach ($container->findTaggedServiceIds('http_middleware') as $id => $attributes) {
-      // @todo Priority sorting.
-      $kernel_map[$id] = $container->getDefinition($id);
+      $priorities[$id] = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
+      $middlewares[$id] = $container->getDefinition($id);
     }
 
-    foreach ($kernel_map as $id => $decorator) {
-      // Prepend the previous kernel as first constructor argument.
-      $arguments = $decorator->getArguments();
-      array_unshift($arguments, new Reference($previous_id));
-      $decorator->setArguments($arguments);
-
-      $previous_id = $id;
-      $http_kernel = $decorator;
+    if (empty($middlewares)) {
+      $container->addAliases(array('http_kernel_stack' => 'http_kernel'));
     }
+    else {
+      array_multisort($priorities, SORT_DESC, $middlewares, SORT_DESC);
+
+      $previous_id = 'http_kernel';
+      $first = $http_kernel = $container->getDefinition('http_kernel');
 
-    // Register the 'stack' service as being the very first one http stacked
-    // kernel that will decorate all others. 
-    $container->addAliases(array(
-      'http_kernel_stack' => $id,
-    ));
+      foreach ($middlewares as $id => $decorator) {
+        // Prepend the previous kernel as first constructor argument.
+        $arguments = $decorator->getArguments();
+        array_unshift($arguments, new Reference($previous_id));
+        $decorator->setArguments($arguments);
+
+        $previous_id = $id;
+        $http_kernel = $decorator;
+      }
+
+      // Register the 'stack' service as being the very first one http stacked
+      // kernel that will decorate all others.
+      $container->addAliases(array('http_kernel_stack' => $id));
+    }
   }
 
 }