diff --git a/src/wp-includes/html-api/class-wp-html-processor.php b/src/wp-includes/html-api/class-wp-html-processor.php
index ba03ff44d7e53..67bccab7b35c6 100644
--- a/src/wp-includes/html-api/class-wp-html-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-processor.php
@@ -1304,10 +1304,11 @@ public function serialize(): ?string {
 	 * @see static::serialize()
 	 *
 	 * @since 6.7.0
+	 * @since 6.9.0 Converted from protected to public method.
 	 *
 	 * @return string Serialization of token, or empty string if no serialization exists.
 	 */
-	protected function serialize_token(): string {
+	public function serialize_token(): string {
 		$html       = '';
 		$token_type = $this->get_token_type();