diff --git a/packages/core-js/internals/function-uncurry-this.js b/packages/core-js/internals/function-uncurry-this.js
index 4add61f64311..20723a0c31ba 100644
--- a/packages/core-js/internals/function-uncurry-this.js
+++ b/packages/core-js/internals/function-uncurry-this.js
@@ -1,4 +1,3 @@
-var fails = require('../internals/fails');
 var NATIVE_BIND = require('../internals/function-bind-native');
 
 var FunctionPrototype = Function.prototype;
@@ -6,15 +5,9 @@ var bind = FunctionPrototype.bind;
 var call = FunctionPrototype.call;
 var uncurryThis = NATIVE_BIND && bind.bind(call, call);
 
-var UNCURRY_WITH_NATIVE_BIND = NATIVE_BIND && !fails(function () {
+module.exports = function (fn) {
   // Nashorn bug, https://github.com/zloirock/core-js/issues/1128
-  return uncurryThis(''.slice)('12', 1) !== '2';
-});
-
-module.exports = UNCURRY_WITH_NATIVE_BIND ? function (fn) {
-  return fn && uncurryThis(fn);
-} : function (fn) {
-  return fn && function () {
+  return fn && (NATIVE_BIND && fn instanceof Function ? uncurryThis(fn) : function () {
     return call.apply(fn, arguments);
-  };
+  });
 };