diff --git modules/system/system.module modules/system/system.module
index b5dfc54..aeac11e 100644
--- modules/system/system.module
+++ modules/system/system.module
@@ -638,7 +638,7 @@ function system_menu() {
 
   foreach (list_themes() as $theme) {
     $items['admin/appearance/settings/' . $theme->name] = array(
-      'title' => $theme->info['name'],
+      'title' => check_plain($theme->info['name']),
       'page arguments' => array('system_theme_settings', $theme->name),
       'type' => MENU_LOCAL_TASK,
       'access callback' => '_system_themes_access',