diff --git a/wp-includes/sitemaps/class-wp-sitemaps-provider.php b/wp-includes/sitemaps/class-wp-sitemaps-provider.php
index 3440f62b34..e77681d721 100644
--- a/wp-includes/sitemaps/class-wp-sitemaps-provider.php
+++ b/wp-includes/sitemaps/class-wp-sitemaps-provider.php
@@ -160,7 +160,7 @@ abstract class WP_Sitemaps_Provider {
 		);
 
 		if ( ! $wp_rewrite->using_permalinks() ) {
-			$basename = '/?' . http_build_query( $params, null, '&' );
+			$basename = '/?' . http_build_query( $params, '', '&' );
 		}
 
 		return home_url( $basename );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 68c87cfe7f..b670481167 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51651';
+$wp_version = '5.9-alpha-51652';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.