diff --git a/index.js b/index.js
index ea40de9..cc98684 100644
--- a/index.js
+++ b/index.js
@@ -1,9 +1,11 @@
-var config = require(__dirname + '/config.json');
-var redbird = require('redbird')(config.server_options);
+"use strict";
 
-var hostsCount = config.hosts.length;
-for (var i=0; i < hostsCount; i++) {
-    var host = config.hosts[i]
+const config = require(__dirname + '/config.json');
+const redbird = require('redbird')(config.server_options);
+
+const hostsCount = config.hosts.length;
+for (let i=0; i < hostsCount; i++) {
+    let host = config.hosts[i]
     if (!host.disable) {
         redbird.register(host.host, host.target);
     }