diff --git a/.travis.yml b/.travis.yml
index f6594515..60c67159 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,9 @@
 language: node_js
 node_js:
-   - "4"
-   - "6"
-   - "7"
+  - "0.12"
+  - "4"
+  - "6"
+  - "7"
 os:
   - linux
 before_install:
diff --git a/constants.js b/constants.js
index 678ebfea..2522b4cc 100644
--- a/constants.js
+++ b/constants.js
@@ -69,13 +69,13 @@ var csts = {
   TRACE_FLUSH_INTERVAL    : process.env.PM2_DEBUG || process.env.NODE_ENV === 'local_test' ? 1000 : 60000,
 
   // Concurrent actions when doing start/restart/reload
-  CONCURRENT_ACTIONS      : ((() => {
+  CONCURRENT_ACTIONS      : (function() {
     var concurrent_actions = parseInt(process.env.PM2_CONCURRENT_ACTIONS) || 1;
     if (semver.satisfies(process.versions.node, '>= 4.0.0'))
       concurrent_actions = 2;
     debug('Using %d parallelism (CONCURRENT_ACTIONS)', concurrent_actions);
     return concurrent_actions;
-  }))(),
+  })(),
 
   DEBUG                   : process.env.PM2_DEBUG || false,
   WEB_IPADDR              : process.env.PM2_API_IPADDR || '0.0.0.0',
diff --git a/lib/API/Configuration.js b/lib/API/Configuration.js
index 3add1ac1..01b4439a 100644
--- a/lib/API/Configuration.js
+++ b/lib/API/Configuration.js
@@ -9,26 +9,28 @@ var Configuration        = require('../Configuration.js');
 //@todo double check that imported methods works
 var InteractorDaemonizer = require('../Interactor/InteractorDaemonizer');
 
-module.exports = CLI => {
+module.exports = function(CLI) {
 
   CLI.prototype.get = function(key, cb) {
     var that = this;
 
     if (!key || key == 'all') {
-      displayConf((err, data) => {
+      displayConf(function(err, data) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
         return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
       });
       return false;
     }
-    Configuration.get(key, (err, data) => {
+    Configuration.get(key, function(err, data) {
       if (err) {
         return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
       }
       // pm2 conf module-name
       if (key.indexOf(':') === -1 && key.indexOf('.') === -1) {
-        displayConf(key, () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+        displayConf(key, function() {
+          return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT)
+        });
         return false;
       }
       // pm2 conf module-name:key
@@ -53,7 +55,7 @@ module.exports = CLI => {
     var that = this;
 
     if (!key) {
-      interactiveConfigEdit(err => {
+      interactiveConfigEdit(function(err) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
         return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
@@ -68,17 +70,21 @@ module.exports = CLI => {
      */
     if (key.indexOf('pm2:passwd') > -1) {
       value = Password.generate(value);
-      Configuration.set(key, value, err => {
+      Configuration.set(key, value, function(err) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
-        InteractorDaemonizer.launchRPC(that._conf, err => {
+        InteractorDaemonizer.launchRPC(that._conf, function(err) {
           if (err) {
-            displayConf('pm2', () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+            displayConf('pm2', function() {
+              return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT)
+            });
             return false;
           }
-          InteractorDaemonizer.rpc.passwordSet(() => {
-            InteractorDaemonizer.disconnectRPC(() => {
-              displayConf('pm2', () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+          InteractorDaemonizer.rpc.passwordSet(function() {
+            InteractorDaemonizer.disconnectRPC(function() {
+              displayConf('pm2', function() {
+                return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
+              });
             });
           });
           return false;
@@ -90,7 +96,7 @@ module.exports = CLI => {
     /**
      * Set value
      */
-    Configuration.set(key, value, err => {
+    Configuration.set(key, value, function(err) {
       if (err)
         return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
 
@@ -109,22 +115,26 @@ module.exports = CLI => {
         process.env.PM2_PROGRAMMATIC = 'true';
         that.restart(app_name, {
           updateEnv : true
-        }, (err, data) => {
+        }, function(err, data) {
           process.env.PM2_PROGRAMMATIC = 'false';
           if (!err)
             Common.printOut(cst.PREFIX_MSG + 'Module %s restarted', app_name);
-          displayConf(app_name, () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+          displayConf(app_name, function() {
+            return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
+          });
         });
         return false;
       }
-      displayConf(null, () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+      displayConf(null, function() {
+        return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
+      });
     });
   };
 
   CLI.prototype.multiset = function(serial, cb) {
     var that = this;
 
-    Configuration.multiset(serial, (err, data) => {
+    Configuration.multiset(serial, function(err, data) {
       if (err)
         return cb ? cb({success:false, err:err}) : that.exitCli(cst.ERROR_EXIT);
 
@@ -144,28 +154,31 @@ module.exports = CLI => {
         process.env.PM2_PROGRAMMATIC = 'true';
         that.restart(app_name, {
           updateEnv : true
-        }, (err, data) => {
+        }, function(err, data) {
           process.env.PM2_PROGRAMMATIC = 'false';
           if (!err)
             Common.printOut(cst.PREFIX_MSG + 'Module %s restarted', app_name);
-          displayConf(app_name, () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+          displayConf(app_name, function() {
+            return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT)
+          });
         });
         return false;
       }
-      displayConf(app_name, () => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
-
+      displayConf(app_name, function() {
+        return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT)
+      });
     });
   };
 
   CLI.prototype.unset = function(key, cb) {
     var that = this;
 
-    Configuration.unset(key, err => {
+    Configuration.unset(key, function(err) {
       if (err) {
         return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
       }
 
-      displayConf(() => cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT));
+      displayConf(function() { cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT) });
     });
   };
 
@@ -179,7 +192,7 @@ module.exports = CLI => {
 
     // If key + value = set
     if (key && value) {
-      that.set(key, value, err => {
+      that.set(key, value, function(err) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
         return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
@@ -187,14 +200,14 @@ module.exports = CLI => {
     }
     // If only key = get
     else if (key) {
-      that.get(key, (err, data) => {
+      that.get(key, function(err, data) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
         return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
       });
     }
     else {
-      interactiveConfigEdit(err => {
+      interactiveConfigEdit(function(err) {
         if (err)
           return cb ? cb(Common.retErr(err)) : that.exitCli(cst.ERROR_EXIT);
         return cb ? cb(null, {success:true}) : that.exitCli(cst.SUCCESS_EXIT);
@@ -205,7 +218,7 @@ module.exports = CLI => {
 };
 
 function interactiveConfigEdit(cb) {
-  UX.openEditor(cst.PM2_MODULE_CONF_FILE, (err, data) => {
+  UX.openEditor(cst.PM2_MODULE_CONF_FILE, function(err, data) {
     Common.printOut(chalk.bold('Module configuration (%s) edited.'), cst.PM2_MODULE_CONF_FILE);
     Common.printOut(chalk.bold('To take changes into account, please restart module related.'), cst.PM2_MODULE_CONF_FILE);
     if (err)
@@ -224,7 +237,7 @@ function displayConf(target_app, cb) {
     target_app = null;
   }
 
-  Configuration.getAll((err, data) => {
+  Configuration.getAll(function(err, data) {
     UX.dispKeys(data, target_app);
     return cb();
   });
diff --git a/package.json b/package.json
index a5ebf8e6..6831b9fc 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "preferGlobal": true,
   "version": "3.0.0",
   "engines": {
-    "node": ">=4"
+    "node": ">=0.12"
   },
   "directories": {
     "bin": "./bin",