diff --git a/lib/6to5/transformation/templates/get.js b/lib/6to5/transformation/templates/get.js
index d30b217f17..87e4f7218f 100644
--- a/lib/6to5/transformation/templates/get.js
+++ b/lib/6to5/transformation/templates/get.js
@@ -1,11 +1,11 @@
 (function get(object, property, receiver) {
   var desc = Object.getOwnPropertyDescriptor(object, property);
 
-  if (desc === void 0) {
+  if (desc === undefined) {
     var parent = Object.getPrototypeOf(object);
 
     if (parent === null) {
-      return void 0;
+      return undefined;
     } else {
       return get(parent);
     }
@@ -14,8 +14,8 @@
   } else {
     var getter = desc.get;
 
-    if (getter === void 0) {
-      return void 0;
+    if (getter === undefined) {
+      return undefined;
     }
 
     return getter.call(receiver);
diff --git a/test/fixtures/transformation/es6-classes/accessing-super-class/expected.js b/test/fixtures/transformation/es6-classes/accessing-super-class/expected.js
index a73324009d..6900d5d283 100644
--- a/test/fixtures/transformation/es6-classes/accessing-super-class/expected.js
+++ b/test/fixtures/transformation/es6-classes/accessing-super-class/expected.js
@@ -4,11 +4,11 @@ var _slice = Array.prototype.slice;
 var _get = function get(object, property, receiver) {
   var desc = Object.getOwnPropertyDescriptor(object, property);
 
-  if (desc === void 0) {
+  if (desc === undefined) {
     var parent = Object.getPrototypeOf(object);
 
     if (parent === null) {
-      return void 0;
+      return undefined;
     } else {
       return get(parent);
     }
@@ -16,8 +16,8 @@ var _get = function get(object, property, receiver) {
     return desc.value;
   } else {
     var getter = desc.get;
-    if (getter === void 0) {
-      return void 0;
+    if (getter === undefined) {
+      return undefined;
     }
     return getter.call(receiver);
   }
diff --git a/test/fixtures/transformation/es6-classes/accessing-super-properties/expected.js b/test/fixtures/transformation/es6-classes/accessing-super-properties/expected.js
index 80d88837a8..0afdcd06c1 100644
--- a/test/fixtures/transformation/es6-classes/accessing-super-properties/expected.js
+++ b/test/fixtures/transformation/es6-classes/accessing-super-properties/expected.js
@@ -3,11 +3,11 @@
 var _get = function get(object, property, receiver) {
   var desc = Object.getOwnPropertyDescriptor(object, property);
 
-  if (desc === void 0) {
+  if (desc === undefined) {
     var parent = Object.getPrototypeOf(object);
 
     if (parent === null) {
-      return void 0;
+      return undefined;
     } else {
       return get(parent);
     }
@@ -15,8 +15,8 @@ var _get = function get(object, property, receiver) {
     return desc.value;
   } else {
     var getter = desc.get;
-    if (getter === void 0) {
-      return void 0;
+    if (getter === undefined) {
+      return undefined;
     }
     return getter.call(receiver);
   }
diff --git a/test/fixtures/transformation/es6-classes/calling-super-properties/expected.js b/test/fixtures/transformation/es6-classes/calling-super-properties/expected.js
index 015bca81e1..090e82a9bb 100644
--- a/test/fixtures/transformation/es6-classes/calling-super-properties/expected.js
+++ b/test/fixtures/transformation/es6-classes/calling-super-properties/expected.js
@@ -3,11 +3,11 @@
 var _get = function get(object, property, receiver) {
   var desc = Object.getOwnPropertyDescriptor(object, property);
 
-  if (desc === void 0) {
+  if (desc === undefined) {
     var parent = Object.getPrototypeOf(object);
 
     if (parent === null) {
-      return void 0;
+      return undefined;
     } else {
       return get(parent);
     }
@@ -15,8 +15,8 @@ var _get = function get(object, property, receiver) {
     return desc.value;
   } else {
     var getter = desc.get;
-    if (getter === void 0) {
-      return void 0;
+    if (getter === undefined) {
+      return undefined;
     }
     return getter.call(receiver);
   }
diff --git a/test/fixtures/transformation/es6-classes/super-function-fallback/expected.js b/test/fixtures/transformation/es6-classes/super-function-fallback/expected.js
index b2763dda75..c7fd43b7ff 100644
--- a/test/fixtures/transformation/es6-classes/super-function-fallback/expected.js
+++ b/test/fixtures/transformation/es6-classes/super-function-fallback/expected.js
@@ -3,11 +3,11 @@
 var _get = function get(object, property, receiver) {
   var desc = Object.getOwnPropertyDescriptor(object, property);
 
-  if (desc === void 0) {
+  if (desc === undefined) {
     var parent = Object.getPrototypeOf(object);
 
     if (parent === null) {
-      return void 0;
+      return undefined;
     } else {
       return get(parent);
     }
@@ -15,8 +15,8 @@ var _get = function get(object, property, receiver) {
     return desc.value;
   } else {
     var getter = desc.get;
-    if (getter === void 0) {
-      return void 0;
+    if (getter === undefined) {
+      return undefined;
     }
     return getter.call(receiver);
   }