diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php
index dbdca575089fc..eb4d1145a4966 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php
@@ -15,14 +15,6 @@
  * @see WP_REST_Autosaves_Controller
  */
 class WP_REST_Template_Autosaves_Controller extends WP_REST_Autosaves_Controller {
-	/**
-	 * Parent post type.
-	 *
-	 * @since 6.4.0
-	 * @var string
-	 */
-	private $parent_post_type;
-
 	/**
 	 * Parent post controller.
 	 *
@@ -56,7 +48,6 @@ class WP_REST_Template_Autosaves_Controller extends WP_REST_Autosaves_Controller
 	 */
 	public function __construct( $parent_post_type ) {
 		parent::__construct( $parent_post_type );
-		$this->parent_post_type = $parent_post_type;
 		$post_type_object       = get_post_type_object( $parent_post_type );
 		$parent_controller      = $post_type_object->get_rest_controller();