diff --git a/core/modules/views/src/Ajax/ReplaceTitleCommand.php b/core/modules/views/src/Ajax/ReplaceTitleCommand.php
index 8972969..4d5bb63 100644
--- a/core/modules/views/src/Ajax/ReplaceTitleCommand.php
+++ b/core/modules/views/src/Ajax/ReplaceTitleCommand.php
@@ -39,7 +39,7 @@ public function __construct($title) {
   public function render() {
     return array(
       'command' => 'viewsReplaceTitle',
-      'selector' => $this->title,
+      'title' => $this->title,
     );
   }
 
diff --git a/core/modules/views_ui/js/ajax.js b/core/modules/views_ui/js/ajax.js
index e30b4c1..00cffe9 100644
--- a/core/modules/views_ui/js/ajax.js
+++ b/core/modules/views_ui/js/ajax.js
@@ -27,14 +27,13 @@
   Drupal.AjaxCommands.prototype.viewsReplaceTitle = function (ajax, response, status) {
     var doc = document;
     // For the <title> element, make a best-effort attempt to replace the page
-    // title and leave the site name alone. If the theme doesn't use the site
-    // name in the <title> element, this will fail.
+    // title and leave the site name alone.
     var oldTitle = doc.title;
-    // Escape the site name, in case it has special characters in it, so we can
-    // use it in our regex.
-    var escapedSiteName = response.siteName.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
-    var re = new RegExp('.+ (.) ' + escapedSiteName);
-    doc.title = oldTitle.replace(re, response.title + ' $1 ' + response.siteName);
+    // Escape the current page title, in case it has special characters in it,
+    // so we can use it in our regex.
+    var escapedPageTitle = $('h1.page-title').text().replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
+    var re = new RegExp(escapedPageTitle + ' (.) (.+)');
+    doc.title = oldTitle.replace(re, response.title + ' $1 $2');
 
     $('h1.page-title').text(response.title);
   };