diff --git a/xmlrpc.php b/xmlrpc.php
index d2d8b88d22..9874a25435 100644
--- a/xmlrpc.php
+++ b/xmlrpc.php
@@ -2556,7 +2556,7 @@ class wp_xmlrpc_server extends IXR_Server {
 					foreach ( (array) $val as $enc ) {
 						$encdata = split("\n", $enc);
 						$enclosure['url'] = trim(htmlspecialchars($encdata[0]));
-						$enclosure['length'] = trim($encdata[1]);
+						$enclosure['length'] = (int) trim($encdata[1]);
 						$enclosure['type'] = trim($encdata[2]);
 						break 2;
 					}