diff --git a/packages/babel/test/fixtures/transformation/es6.parameters/options.json b/packages/babel/test/fixtures/transformation/es6.parameters/options.json
new file mode 100644
index 0000000000..7d6e6cda1c
--- /dev/null
+++ b/packages/babel/test/fixtures/transformation/es6.parameters/options.json
@@ -0,0 +1,3 @@
+{
+  "externalHelpers": true
+}
diff --git a/packages/babel/test/fixtures/transformation/es6.parameters/rest-nested-iife/expected.js b/packages/babel/test/fixtures/transformation/es6.parameters/rest-nested-iife/expected.js
index 438a6ffbeb..ef7ece2359 100644
--- a/packages/babel/test/fixtures/transformation/es6.parameters/rest-nested-iife/expected.js
+++ b/packages/babel/test/fixtures/transformation/es6.parameters/rest-nested-iife/expected.js
@@ -1,11 +1,5 @@
 "use strict";
 
-var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ("value" in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };
-
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) subClass.__proto__ = superClass; }
-
 function broken(x) {
   for (var _len = arguments.length, foo = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
     foo[_key - 1] = arguments[_key];
@@ -14,12 +8,11 @@ function broken(x) {
   if (true) {
     var _ret = (function () {
       var Foo = (function (_Bar) {
-        _inherits(Foo, _Bar);
+        babelHelpers.inherits(Foo, _Bar);
 
         function Foo() {
-          _classCallCheck(this, Foo);
-
-          _get(Object.getPrototypeOf(Foo.prototype), "constructor", this).apply(this, arguments);
+          babelHelpers.classCallCheck(this, Foo);
+          babelHelpers.get(Object.getPrototypeOf(Foo.prototype), "constructor", this).apply(this, arguments);
         }
 
         return Foo;