diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 012d89d1d5e9aaaee0f235f3f1e8297b4ea7b2e1..f917eda9fbfa4ebf0d6a86f5a89a3f72a33f367b 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -1566,7 +1566,10 @@ function _drupal_bootstrap_page_cache() {
 
   // Allow specifying special cache handlers in settings.php, like
   // using memcached or files for storing cache information.
-  require_once DRUPAL_ROOT . '/' . variable_get('cache_inc', 'includes/cache.inc');
+  require_once DRUPAL_ROOT . '/includes/cache.inc';
+  foreach (variable_get('cache_backends', array()) as $include) {
+    require_once DRUPAL_ROOT . '/' . $include;
+  }
   // Check for a cache mode force from settings.php.
   if (variable_get('page_cache_without_database')) {
     $cache_mode = CACHE_NORMAL;
diff --git a/install.php b/install.php
index d440ad46ae02863e0dc4f3d9e583081db2088c20..4ee60902d2146ff28651c7864c09f9aab2f8dbde 100644
--- a/install.php
+++ b/install.php
@@ -267,7 +267,6 @@ function install_begin_request(&$install_state) {
   // suspect, due to the fact that Drupal is not fully set up yet.
   require_once DRUPAL_ROOT . '/includes/cache.inc';
   require_once DRUPAL_ROOT . '/includes/cache-install.inc';
-  $conf['cache_inc'] = 'includes/cache.inc';
   $conf['cache_default_class'] = 'DrupalFakeCache';
 
   // Prepare for themed output, if necessary. We need to run this at the