diff --git a/core/lib/Drupal/Core/Controller/HtmlPageController.php b/core/lib/Drupal/Core/Controller/HtmlPageController.php
index 222e1c3..77e39c5 100644
--- a/core/lib/Drupal/Core/Controller/HtmlPageController.php
+++ b/core/lib/Drupal/Core/Controller/HtmlPageController.php
@@ -58,7 +58,8 @@ public function content(Request $request, $_content) {
         '#title' => '',
       );
     }
-    if (empty($page_content['#title']) && $request->attributes->has('_title')) {
+    // If no title was specified, allow to override it via the request.
+    if ((!isset($page_content['#title']) || $page_content['#title'] === '') && $request->attributes->has('_title')) {
       $page_content['#title'] = $request->attributes->get('_title');
     }