diff --git a/wp-admin/includes/schema.php b/wp-admin/includes/schema.php
index e5710cfaf8..4dd326810f 100644
--- a/wp-admin/includes/schema.php
+++ b/wp-admin/includes/schema.php
@@ -667,7 +667,7 @@ function populate_network( $network_id = 1, $domain = '', $email = '', $site_nam
 
 	if ( !is_multisite() ) {
 		$site_admins = array( $site_user->user_login );
-		$users = get_users();
+		$users = get_users( array( 'fields' => array( 'ID', 'user_login' ) ) );
 		if ( $users ) {
 			foreach ( $users as $user ) {
 				if ( is_super_admin( $user->ID ) && !in_array( $user->user_login, $site_admins ) )