diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 4963f71..82afbaa 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -712,7 +712,7 @@ public function updateModules(array $module_list, array $module_filenames = arra
    *   The class name.
    */
   protected function getClassName() {
-    $parts = array('service_container', $this->environment, hash('crc32b', \Drupal::VERSION), Settings::get('deployment_identifier'));
+    $parts = array('service_container', $this->environment, hash('crc32b', \Drupal::VERSION . Settings::get('deployment_identifier')));
     return implode('_', $parts);
   }
 
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index 69fc722..7c65bec 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -296,7 +296,7 @@
  * must only use characters valid in PHP function names as defined by
  * http://php.net/manual/en/functions.user-defined.php
  */
-$settings['deployment_identifier'] = '';
+$settings['deployment_identifier'] = \Drupal::VERSION;
 
 /**
  * Access control for update.php script.