Index: wp-includes/class.wp-xmlrpc-server.php
===================================================================
--- wp-includes/class.wp-xmlrpc-server.php	(revision 15650)
+++ wp-includes/class.wp-xmlrpc-server.php	(working copy)
@@ -5,6 +5,9 @@
  * @package WordPress
  */
 
+include_once(ABSPATH . 'wp-admin/includes/admin.php');
+include_once(ABSPATH . WPINC . '/class-IXR.php');
+
 /**
  * WordPress XMLRPC server implementation.
  *