diff --git a/wp-includes/class-wp-user.php b/wp-includes/class-wp-user.php
index 2d7c20f9d3..8fd5e5cd21 100644
--- a/wp-includes/class-wp-user.php
+++ b/wp-includes/class-wp-user.php
@@ -125,7 +125,7 @@ class WP_User {
 	 * @param string                      $name    Optional. User's username
 	 * @param int                         $site_id Optional Site ID, defaults to current site.
 	 */
-	public function __construct( $id = 0, $name = '', $site_id = '' ) {
+	public function __construct( $id = 0, $name = '', $site_id = 0 ) {
 		global $wpdb;
 
 		if ( ! isset( self::$back_compat_keys ) ) {
@@ -175,7 +175,7 @@ class WP_User {
 	 * @param object $data    User DB row object.
 	 * @param int    $site_id Optional. The site ID to initialize for.
 	 */
-	public function init( $data, $site_id = '' ) {
+	public function init( $data, $site_id = 0 ) {
 		if ( ! isset( $data->ID ) ) {
 			$data->ID = 0;
 		}
@@ -852,7 +852,7 @@ class WP_User {
 	 *
 	 * @param int $blog_id Optional. Site ID, defaults to current site.
 	 */
-	public function for_blog( $blog_id = '' ) {
+	public function for_blog( $blog_id = 0 ) {
 		_deprecated_function( __METHOD__, '4.9.0', 'WP_User::for_site()' );
 
 		$this->for_site( $blog_id );
@@ -867,7 +867,7 @@ class WP_User {
 	 *
 	 * @param int $site_id Site ID to initialize user capabilities for. Default is the current site.
 	 */
-	public function for_site( $site_id = '' ) {
+	public function for_site( $site_id = 0 ) {
 		global $wpdb;
 
 		if ( ! empty( $site_id ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b97decea26..6a34c51942 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60173';
+$wp_version = '6.9-alpha-60174';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.