diff -u b/core/modules/system/config/system.site.yml b/core/modules/system/config/system.site.yml
--- b/core/modules/system/config/system.site.yml
+++ b/core/modules/system/config/system.site.yml
@@ -5,3 +5,4 @@
-page.front: user
-page.404: ''
-page.403: ''
+page:
+    front: user
+    404: ''
+    403: ''
diff -u b/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
--- b/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -1501,7 +1501,7 @@
   $form['front_page']['site_frontpage'] = array(
     '#type' => 'textfield',
     '#title' => t('Default front page'),
-    '#default_value' => ($site_config->get('site_frontpage') != 'user' ? drupal_get_path_alias($site_config->get('page.front')) : ''),
+    '#default_value' => ($site_config->get('page.front') != 'user' ? drupal_get_path_alias($site_config->get('page.front')) : ''),
     '#size' => 40,
     '#description' => t('Optionally, specify a relative URL to display as the front page.  Leave blank to display the default content feed.'),
     '#field_prefix' => url(NULL, array('absolute' => TRUE)),