diff --git a/tests/baselines/reference/abstractClass1.js b/tests/baselines/reference/abstractClass1.js
index 494673d6ce0..06868a485f5 100644
--- a/tests/baselines/reference/abstractClass1.js
+++ b/tests/baselines/reference/abstractClass1.js
@@ -40,8 +40,7 @@ new Copy();
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var Foo = (function () {
     function Foo(f) {
diff --git a/tests/baselines/reference/classAbstractInheritance.js b/tests/baselines/reference/classAbstractInheritance.js
index 2aa156500e0..6656e4687d2 100644
--- a/tests/baselines/reference/classAbstractInheritance.js
+++ b/tests/baselines/reference/classAbstractInheritance.js
@@ -25,8 +25,7 @@ abstract class GG extends CC {}
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var A = (function () {
     function A() {
diff --git a/tests/baselines/reference/classAbstractSuperCalls.js b/tests/baselines/reference/classAbstractSuperCalls.js
index 7841785ac05..152fd03f463 100644
--- a/tests/baselines/reference/classAbstractSuperCalls.js
+++ b/tests/baselines/reference/classAbstractSuperCalls.js
@@ -31,8 +31,7 @@ abstract class BB extends AA {
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var A = (function () {
     function A() {
diff --git a/tests/baselines/reference/classAbstractUsingAbstractMethod.js b/tests/baselines/reference/classAbstractUsingAbstractMethod.js
index 26a406aa008..74bc80b2630 100644
--- a/tests/baselines/reference/classAbstractUsingAbstractMethod.js
+++ b/tests/baselines/reference/classAbstractUsingAbstractMethod.js
@@ -21,8 +21,7 @@ a.foo();
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var A = (function () {
     function A() {
diff --git a/tests/baselines/reference/classInstantiatingAbstractClass.js b/tests/baselines/reference/classInstantiatingAbstractClass.js
index 5a23d3d9b40..6a2c3f31e37 100644
--- a/tests/baselines/reference/classInstantiatingAbstractClass.js
+++ b/tests/baselines/reference/classInstantiatingAbstractClass.js
@@ -31,8 +31,7 @@ var aa = new myA;
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var A = (function () {
     function A() {
diff --git a/tests/baselines/reference/classWithAbstractMethods.js b/tests/baselines/reference/classWithAbstractMethods.js
index 2035ba20ea9..91ccc5f9306 100644
--- a/tests/baselines/reference/classWithAbstractMethods.js
+++ b/tests/baselines/reference/classWithAbstractMethods.js
@@ -31,8 +31,7 @@ class DD extends AA {
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
 var A = (function () {
     function A() {