diff --git a/core/lib/Drupal/Core/Cache/CacheFactory.php b/core/lib/Drupal/Core/Cache/CacheFactory.php
index da42a26..3558533 100644
--- a/core/lib/Drupal/Core/Cache/CacheFactory.php
+++ b/core/lib/Drupal/Core/Cache/CacheFactory.php
@@ -43,14 +43,7 @@ class CacheFactory {
    *   value.
    */
   public static function getBackends() {
-    // @todo Improve how cache backend classes are defined. Cannot be
-    //   configuration, since e.g. the CachedStorage config storage controller
-    //   requires the definition in its constructor already.
-    global $conf;
-    $cache_backends = isset($conf['cache_classes']) ? $conf['cache_classes'] : array();
-    // Ensure there is a default 'cache' bin definition.
-    $cache_backends += array('cache' => 'Drupal\Core\Cache\DatabaseBackend');
-    return $cache_backends;
+    return variable_get('cache_classes', array('cache' => 'Drupal\Core\Cache\DatabaseBackend'));
   }
 
 }