diff --git a/includes/rules.state.inc b/includes/rules.state.inc
index a4150e7..c2523b1 100644
--- a/includes/rules.state.inc
+++ b/includes/rules.state.inc
@@ -616,8 +616,24 @@ class RulesData  {
    * @see RulesPlugin::availableVariables()
    */
   public static function addSiteMetadata(EntityMetadataWrapper $wrapper, $property_info) {
+    // These variables are from the system module and derived from: 
+    // system_site_information_settings()
+    $site_info['site_name'] = variable_get('site_name', 'Drupal');
+    $site_info['site_slogan'] = variable_get('site_slogan', '');
+    $site_info['site_mail'] = variable_get('site_mail', ini_get('sendmail_from'));
+    $site_info['default_nodes_main'] = variable_get('default_nodes_main', 10);
+    $site_info['site_frontpage'] = (variable_get('site_frontpage')!='node'?drupal_get_path_alias(variable_get('site_frontpage', 'node')):'');
+    $site_info['site_403'] = variable_get('site_403', '');
+    $site_info['site_404'] = variable_get('site_404', '');
+
+    $property_info['properties'] += $site_info;
+
+    // Get site wide properties added by modules, if any!
     $site_info = entity_get_property_info('site');
-    $property_info['properties'] += $site_info['properties'];
+    if (!empty($site_info['properties'])) {
+      $property_info['properties'] += $site_info;
+    }
+
     // Also invoke the usual callback for altering metadata, in case actions
     // have specified further metadata.
     return RulesData::applyMetadataAssertions($wrapper, $property_info);