diff --git a/wp-admin/includes/manifest.php b/wp-admin/includes/manifest.php
index b41eb7a08..15ba7d6d1 100644
--- a/wp-admin/includes/manifest.php
+++ b/wp-admin/includes/manifest.php
@@ -28,6 +28,11 @@ function add_filter() {}
  */
 function attr() {}
 
+/**
+ * @ignore
+ */
+function attribute_escape() {}
+
 /**
  * @ignore
  */