diff --git a/lib/serverMgr.js b/lib/serverMgr.js
index d72e9fb..2331506 100644
--- a/lib/serverMgr.js
+++ b/lib/serverMgr.js
@@ -8,8 +8,8 @@ var getPort   = require('./getPort'),
     url       = require('url'),
     exec      = require('child_process').exec;
 
-if(!fs.exists("cert/tmpCert")){
-    fs.mkdir("cert/tmpCert");
+if(!fs.existsSync("cert/tmpCert")){
+    fs.mkdirSync("cert/tmpCert");
 }
 
 module.exports =function(){