diff --git a/lib/master/starter.js b/lib/master/starter.js
index f23bc3647..177b15168 100644
--- a/lib/master/starter.js
+++ b/lib/master/starter.js
@@ -73,7 +73,7 @@ starter.run = function(app, server, cb) {
     cmd = util.format('cd "%s" && "%s"', app.getBase(), process.execPath);
     var arg = server.args;
     if (arg !== undefined) {
-      cmd += arg;
+      cmd += ' ' + arg;
     }
     cmd += util.format(' "%s" env=%s ', app.get(Constants.RESERVED.MAIN), env);
     for(key in server) {