diff --git a/src/lib/is_plain_object.js b/src/lib/is_plain_object.js
index 2a14a64115f..50f16d8883e 100644
--- a/src/lib/is_plain_object.js
+++ b/src/lib/is_plain_object.js
@@ -21,6 +21,6 @@ module.exports = function isPlainObject(obj) {
 
     return (
         Object.prototype.toString.call(obj) === '[object Object]' &&
-        Object.getPrototypeOf(obj) === Object.prototype
+        Object.getPrototypeOf(obj).hasOwnProperty('hasOwnProperty')
     );
 };