diff --git a/src/wp-admin/includes/schema.php b/src/wp-admin/includes/schema.php
index 70b4686e2e..64ec6b76fb 100644
--- a/src/wp-admin/includes/schema.php
+++ b/src/wp-admin/includes/schema.php
@@ -951,12 +951,16 @@ function populate_network( $network_id = 1, $domain = '', $email = '', $site_nam
 
 	if ( !is_multisite() ) {
 		$site_admins = array( $site_user->user_login );
-		$users = get_users( array( 'fields' => array( 'ID', 'user_login' ) ) );
+		$users = get_users( array(
+			'fields' => array( 'user_login' ),
+			'role'   => 'administrator',
+		) );
 		if ( $users ) {
 			foreach ( $users as $user ) {
-				if ( is_super_admin( $user->ID ) && !in_array( $user->user_login, $site_admins ) )
-					$site_admins[] = $user->user_login;
+				$site_admins[] = $user->user_login;
 			}
+
+			$site_admins = array_unique( $site_admins );
 		}
 	} else {
 		$site_admins = get_site_option( 'site_admins' );