diff --git a/core/lib/Drupal/Core/Update/UpdateKernel.php b/core/lib/Drupal/Core/Update/UpdateKernel.php
index 32314f9..2c9035f 100644
--- a/core/lib/Drupal/Core/Update/UpdateKernel.php
+++ b/core/lib/Drupal/Core/Update/UpdateKernel.php
@@ -27,6 +27,16 @@
 class UpdateKernel extends DrupalKernel {
 
   /**
+   * Whether the container can be cached.
+   *
+   * Don't cache this particular container, so it does not leak into the main
+   * site at all.
+   *
+   * @var bool
+   */
+  protected $allowCaching = FALSE;
+
+  /**
    * {@inheritdoc}
    */
   public function discoverServiceProviders() {
@@ -43,9 +53,6 @@ protected function initializeContainer() {
     // services, see \Drupal\Core\Update\UpdateServiceProvider.
     $this->containerNeedsRebuild = TRUE;
     $container = parent::initializeContainer();
-    // Don't save this particular container to cache, so it does not leak into
-    // the main site at all.
-    $this->allowCaching = FALSE;
     return $container;
   }