diff --git a/wp-admin/admin-ajax.php b/wp-admin/admin-ajax.php
index 7f7db0b77..088ce31b5 100644
--- a/wp-admin/admin-ajax.php
+++ b/wp-admin/admin-ajax.php
@@ -212,7 +212,7 @@ case 'update-meta' :
 case 'add-user' :
 	if ( !current_user_can('edit_users') )
 		die('-1');
-	require_once( ABSPATH . WPINC . '/registration-functions.php');
+	require_once(ABSPATH . WPINC . '/registration.php');
 	$user_id = add_user();
 	if ( is_wp_error( $user_id ) ) {
 		foreach( $user_id->get_error_messages() as $message )
diff --git a/wp-admin/upgrade-functions.php b/wp-admin/upgrade-functions.php
index 97f6410a7..6255504f6 100644
--- a/wp-admin/upgrade-functions.php
+++ b/wp-admin/upgrade-functions.php
@@ -5,7 +5,7 @@ if ( file_exists(ABSPATH . 'wp-content/install.php') )
 require_once(ABSPATH . '/wp-admin/admin-functions.php');
 require_once(ABSPATH . '/wp-admin/admin-db.php');
 require_once(ABSPATH . '/wp-admin/upgrade-schema.php');
-require_once(ABSPATH . '/wp-includes/registration-functions.php');
+require_once(ABSPATH . WPINC . '/registration.php');
 
 if ( !function_exists('wp_install') ) :
 function wp_install($blog_title, $user_name, $user_email, $public, $meta='') {