core/includes/theme.inc           |    8 +++++---
 core/modules/system/system.module |   16 +++++++++++++---
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 0f4ac4d..3716fb7 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2356,6 +2356,8 @@ function theme_get_suggestions($args, $base, $delimiter = '__') {
  * @param array $variables
  *   An associative array containing:
  *   - content - An array of page content.
+ *
+ * @see system_page_build()
  */
 function template_preprocess_maintenance_page(&$variables) {
   global $theme;
@@ -2425,7 +2427,7 @@ function template_preprocess_maintenance_page(&$variables) {
 
   // These are usually added from system_page_build() except maintenance.css.
   // When the database is inactive it's not called so we add it here.
-  $default_css['library'][] = array('system', 'drupal.base');
+  $default_css['library'][] = array('system', 'normalize');
   $path = drupal_get_path('module', 'system');
   // Adjust the weights to load these early.
   $default_css['css'][$path . '/css/system.module.css'] = array(
@@ -2445,8 +2447,8 @@ function template_preprocess_maintenance_page(&$variables) {
     'weight' => CSS_COMPONENT - 10,
     'every_page' => TRUE,
   );
-  $attachment = array('#attached' => $default_css);
-  drupal_render($attachment);
+  $attached = array('#attached' => $default_css);
+  drupal_render($attached);
 
   $variables['head_title_array']  = $head_title;
   $variables['head_title']        = implode(' | ', $head_title);
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 3cf9e28..4dd9677 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -2117,16 +2117,26 @@ function system_filetransfer_info() {
 
 /**
  * Implements hook_page_build().
+ *
+ * @see template_preprocess_maintenance_page()
  */
 function system_page_build(&$page) {
   // Ensure the same CSS is loaded in template_preprocess_maintenance_page().
   $page['#attached']['library'][] = array('system', 'normalize');
   $path = drupal_get_path('module', 'system');
   // Adjust the weights to load these early.
-  $page['#attached']['css'][$path . '/css/system.module.css'] = array('weight' => CSS_COMPONENT - 10, 'every_page' => TRUE);
-  $page['#attached']['css'][$path . '/css/system.theme.css'] = array('weight' => CSS_SKIN - 10, 'every_page' => TRUE);
+  $page['#attached']['css'][$path . '/css/system.module.css'] = array(
+    'weight' => CSS_COMPONENT - 10,
+    'every_page' => TRUE,
+  );
+  $page['#attached']['css'][$path . '/css/system.theme.css'] = array(
+    'weight' => CSS_SKIN - 10,
+    'every_page' => TRUE,
+  );
   if (path_is_admin(current_path())) {
-    $page['#attached']['css'][$path . '/css/system.admin.css'] = array('weight' => CSS_COMPONENT - 10);
+    $page['#attached']['css'][$path . '/css/system.admin.css'] = array(
+      'weight' => CSS_COMPONENT - 10,
+    );
   }
 }