diff --git a/lib/API.js b/lib/API.js
index 7c7b997bd..60c69380d 100644
--- a/lib/API.js
+++ b/lib/API.js
@@ -4,14 +4,14 @@
  * can be found in the LICENSE file.
  */
 
-var commander   = require('commander');
-var fs          = require('fs');
-var path        = require('path');
-var async       = require('async');
-var debug       = require('debug')('pm2:cli');
-var util        = require('util');
-var chalk       = require('chalk');
-var fclone      = require('fclone');
+const commander   = require('commander');
+const fs          = require('fs');
+const path        = require('path');
+const async       = require('async');
+const debug       = require('debug')('pm2:cli');
+const util        = require('util');
+const chalk       = require('chalk');
+const fclone      = require('fclone');
 
 var conf         = require('../constants.js');
 var Client      = require('./Client');
@@ -49,7 +49,7 @@ class API {
 
   constructor (opts) {
     if (!opts) opts = {};
-    var that = this;
+    const that = this;
 
     this.daemon_mode = typeof(opts.daemon_mode) == 'undefined' ? true : opts.daemon_mode;
     this.pm2_home = conf.PM2_ROOT_PATH;
@@ -78,8 +78,8 @@ class API {
     }
     else if (opts.independent == true && conf.IS_WINDOWS === false) {
       // Create an unique pm2 instance
-      var crypto = require('crypto');
-      var random_file = crypto.randomBytes(8).toString('hex');
+      const crypto = require('crypto');
+      const random_file = crypto.randomBytes(8).toString('hex');
       this.pm2_home = path.join('/tmp', random_file);
 
       // If we dont explicitly tell to have a daemon
@@ -111,7 +111,7 @@ class API {
     this.gl_is_km_linked = false;
 
     try {
-      var pid = fs.readFileSync(conf.INTERACTOR_PID_PATH);
+      const pid = fs.readFileSync(conf.INTERACTOR_PID_PATH);
       pid = parseInt(pid.toString().trim());
       process.kill(pid, 0);
       that.gl_is_km_linked = true;