diff --git a/wp-admin/network/sites.php b/wp-admin/network/sites.php
index f72711550b..e14e9105ad 100644
--- a/wp-admin/network/sites.php
+++ b/wp-admin/network/sites.php
@@ -102,7 +102,7 @@ if ( isset( $_GET['action'] ) ) {
 			header( 'Content-Type: text/html; charset=utf-8' );
 		}
 
-		if ( get_network()->site_id == $id ) {
+		if ( is_main_site( $id ) ) {
 			wp_die( __( 'Sorry, you are not allowed to change the current site.' ) );
 		}
 
@@ -142,7 +142,7 @@ if ( isset( $_GET['action'] ) ) {
 			}
 
 			$updated_action = 'not_deleted';
-			if ( '0' != $id && get_network()->site_id != $id && current_user_can( 'delete_site', $id ) ) {
+			if ( '0' != $id && ! is_main_site( $id ) && current_user_can( 'delete_site', $id ) ) {
 				wpmu_delete_blog( $id, true );
 				$updated_action = 'delete';
 			}
@@ -154,7 +154,7 @@ if ( isset( $_GET['action'] ) ) {
 			foreach ( (array) $_POST['site_ids'] as $site_id ) {
 				$site_id = (int) $site_id;
 
-				if ( get_network()->site_id == $site_id ) {
+				if ( is_main_site( $site_id ) ) {
 					continue;
 				}
 
@@ -182,7 +182,7 @@ if ( isset( $_GET['action'] ) ) {
 				$doaction = $_POST['action'];
 
 				foreach ( (array) $_POST['allblogs'] as $key => $val ) {
-					if ( '0' != $val && get_network()->site_id != $val ) {
+					if ( '0' != $val && ! is_main_site( $val ) ) {
 						switch ( $doaction ) {
 							case 'delete':
 								require_once ABSPATH . 'wp-admin/admin-header.php';
diff --git a/wp-admin/network/users.php b/wp-admin/network/users.php
index 70964262f0..8d64d5c79b 100644
--- a/wp-admin/network/users.php
+++ b/wp-admin/network/users.php
@@ -94,7 +94,7 @@ if ( isset( $_GET['action'] ) ) {
 								$blogs        = get_blogs_of_user( $user_id, true );
 
 								foreach ( (array) $blogs as $details ) {
-									if ( get_network()->site_id != $details->userblog_id ) { // Main blog is not a spam!
+									if ( ! is_main_site( $details->userblog_id ) ) { // Main site is not a spam!
 										update_blog_status( $details->userblog_id, 'spam', '1' );
 									}
 								}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 51135f0861..5804db9278 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55671';
+$wp_version = '6.3-alpha-55672';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.