diff --git a/lib/chai-exclude.js b/lib/chai-exclude.js
index 9ef14f2..ccd8310 100644
--- a/lib/chai-exclude.js
+++ b/lib/chai-exclude.js
@@ -97,7 +97,7 @@ module.exports = (chai, utils) => {
    * @returns {Boolean}
    */
   function isObject (arg) {
-    return arg instanceof Object && arg.constructor === Object
+    return arg === Object(arg) && Object.prototype.toString.call(arg) !== '[object Array]'
   }
 
   /**