diff --git a/lib/API.js b/lib/API.js
index 0e2bed944..8b7bf2fa6 100644
--- a/lib/API.js
+++ b/lib/API.js
@@ -322,7 +322,7 @@ class API {
     if (!opts) opts = {};
 
     var that = this;
-    if (util.isArray(opts.watch) && opts.watch.length === 0)
+    if (Array.isArray(opts.watch) && opts.watch.length === 0)
       opts.watch = (opts.rawArgs ? !!~opts.rawArgs.indexOf('--watch') : !!~process.argv.indexOf('--watch')) || false;
 
     if (Common.isConfigFile(cmd) || (typeof(cmd) === 'object')) {
@@ -1611,7 +1611,7 @@ class API {
 
     delete appConf.exec_mode;
 
-    if (util.isArray(appConf.watch) && appConf.watch.length === 0) {
+    if (Array.isArray(appConf.watch) && appConf.watch.length === 0) {
       if (!~opts.rawArgs.indexOf('--watch'))
         delete appConf.watch
     }
diff --git a/lib/Watcher.js b/lib/Watcher.js
index 9dbe6b095..9835ec7f9 100644
--- a/lib/Watcher.js
+++ b/lib/Watcher.js
@@ -29,7 +29,7 @@ module.exports = function ClusterMode(God) {
 
     var watch = pm2_env.watch
 
-    if(typeof watch == 'boolean' || util.isArray(watch) && watch.length === 0)
+    if(typeof watch == 'boolean' || Array.isArray(watch) && watch.length === 0)
       watch = pm2_env.pm_cwd;
 
     log('Watching %s', watch);