-var findIndex = require('../array/virtual/find-index');
+var isPrototypeOf = require('../../internals/object-is-prototype-of');
+var method = require('../array/virtual/find-index');
var ArrayPrototype = Array.prototype;
module.exports = function (it) {
var own = it.findIndex;
- return it === ArrayPrototype || (it instanceof Array && own === ArrayPrototype.findIndex) ? findIndex : own;
+ return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.findIndex) ? method : own;
};