diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 6ea20b8..ed4ff79 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1323,7 +1323,7 @@ function template_preprocess_html(&$variables) {
   // Construct page title.
   if (!empty($variables['page']['#title'])) {
     $head_title = array(
-      'title' => trim(strip_tags($variables['page']['#title'])),
+      'title' => SafeMarkup::checkAdminXss(trim(strip_tags($variables['page']['#title']))),
       'name' => $site_config->get('name'),
     );
   }