diff --git a/src/wp-includes/html-api/class-wp-html-attribute-sourcer.php b/src/wp-includes/html-api/class-wp-html-attribute-sourcer.php
index c66ffbf4550c8..f7ddb75cae2bc 100644
--- a/src/wp-includes/html-api/class-wp-html-attribute-sourcer.php
+++ b/src/wp-includes/html-api/class-wp-html-attribute-sourcer.php
@@ -48,8 +48,6 @@
  *     video
  */
 
-require_once __DIR__ . '/class-wp-html-processor.php';
-
 /*
  * @see PHP docs for array_is_list: user-contributed polyfill
  */