diff --git a/lib/server/rest.js b/lib/server/rest.js
index 99f0a42e..c08d1a04 100644
--- a/lib/server/rest.js
+++ b/lib/server/rest.js
@@ -89,7 +89,7 @@
         }
         
         if( Util.isContainStr(lCmd, 'fs') ){
-            pParams.request.url += '?json';
+            pParams.request.url = lCmd + '?json';
             onFS({
                 request : pParams.request,
                 response: pParams.response,