diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 32fc560..801ad36 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -253,7 +253,7 @@ public static function createFromRequest(Request $request, $class_loader, $envir
         && Settings::get('class_loader_auto_detect', TRUE)
         && Settings::get('hash_salt', FALSE)
         && function_exists('apc_fetch')) {
-      $prefix = $this->getApcKey('class_loader');
+      $prefix = static::getApcKey('class_loader');
       $apc_loader = new \Symfony\Component\ClassLoader\ApcClassLoader($prefix, $class_loader);
       $class_loader->unregister();
       $apc_loader->register();
@@ -431,7 +431,7 @@ public function boot() {
       }
     }
     FileCacheFactory::setConfiguration($configuration);
-    FileCacheFactory::setPrefix($this->getApcKey('file_cache'));
+    FileCacheFactory::setPrefix(static::getApcKey('file_cache'));
 
     // Initialize the container.
     $this->initializeContainer();