diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 02d9206..8f052ba 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -432,7 +432,7 @@ public function boot() {
       }
     }
     FileCacheFactory::setConfiguration($configuration);
-    FileCacheFactory::setPrefix(hash('sha256', 'FileCache' . Settings::get('hash_salt')));
+    FileCacheFactory::setPrefix(Settings::getApcuPrefix('file_cache', $this->root));
 
     // Initialize the container.
     $this->initializeContainer();