diff --git a/lib/utils.js b/lib/utils.js
index 523cde013..8a1c09404 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -204,7 +204,8 @@ module.exports.isFunction = function(value) {
  * @return {boolean} True if it is an array.
  */
 module.exports.isArray = function(value) {
-    return Boolean(value && value.constructor === Array);
+    return Array.isArray ? Array.isArray(value) :
+        Boolean(value && value.constructor === Array);
 };
 
 /**