diff --git a/usr/local/www/xmlrpc.php b/usr/local/www/xmlrpc.php
index ebb3a24d7e..9deffcc468 100755
--- a/usr/local/www/xmlrpc.php
+++ b/usr/local/www/xmlrpc.php
@@ -372,6 +372,8 @@ function get_notices_xmlrpc($raw_params) {
 	return $response;
 }
 
+$xmlrpclockkey = lock('xmlrpc', LOCK_EX);
+
 /*****************************/
 $server = new XML_RPC_Server(
         array(
@@ -412,4 +414,6 @@ $server = new XML_RPC_Server(
         )
 );
 
+unlock($xmlrpclockkey);
+
 ?>