diff --git a/lib/6to5/transformers/classes.js b/lib/6to5/transformers/classes.js
index 9059f54ed5..09e6aa16de 100644
--- a/lib/6to5/transformers/classes.js
+++ b/lib/6to5/transformers/classes.js
@@ -102,7 +102,7 @@ var buildClassBody = function (body, className, superName, node) {
 
       if (kind === "") {
         kind = "value";
-        util.pushMutatorMap(mutatorMap, methodName, "writeable", b.identifier("true"));
+        util.pushMutatorMap(mutatorMap, methodName, "writable", b.identifier("true"));
       }
 
       util.pushMutatorMap(mutatorMap, methodName, kind, node);
diff --git a/test/fixtures/syntax/classes/accessing-super-class/expected.js b/test/fixtures/syntax/classes/accessing-super-class/expected.js
index 5535b50c4a..797739f07c 100644
--- a/test/fixtures/syntax/classes/accessing-super-class/expected.js
+++ b/test/fixtures/syntax/classes/accessing-super-class/expected.js
@@ -27,7 +27,7 @@ var Test = function(Foo) {
 
   Object.defineProperties(Test.prototype, {
     test: {
-      writeable: true,
+      writable: true,
 
       value: function() {
         Foo.prototype.test.call(this);
@@ -43,7 +43,7 @@ var Test = function(Foo) {
 
   Object.defineProperties(Test, {
     foo: {
-      writeable: true,
+      writable: true,
 
       value: function() {
         Foo.foo.call(this);
diff --git a/test/fixtures/syntax/classes/calling-super-properties/expected.js b/test/fixtures/syntax/classes/calling-super-properties/expected.js
index 1bd9713d8f..a509647767 100644
--- a/test/fixtures/syntax/classes/calling-super-properties/expected.js
+++ b/test/fixtures/syntax/classes/calling-super-properties/expected.js
@@ -14,7 +14,7 @@ var Test = function(Foo) {
   Test.__proto__ = Foo;
   Object.defineProperties(Test, {
     test: {
-      writeable: true,
+      writable: true,
 
       value: function() {
         return Foo.wow.call(this);
diff --git a/test/fixtures/syntax/classes/instance-method/expected.js b/test/fixtures/syntax/classes/instance-method/expected.js
index be895733ce..2bccbfb4ab 100644
--- a/test/fixtures/syntax/classes/instance-method/expected.js
+++ b/test/fixtures/syntax/classes/instance-method/expected.js
@@ -2,7 +2,7 @@ var Test = function () {
   var Test = function Test() { };
   Object.defineProperties(Test.prototype, {
     test: {
-      writeable: true,
+      writable: true,
       value: function () {
         return 5 + 5;
       }
diff --git a/test/fixtures/syntax/classes/static/expected.js b/test/fixtures/syntax/classes/static/expected.js
index 2d08f0f4c9..e41390aeb8 100644
--- a/test/fixtures/syntax/classes/static/expected.js
+++ b/test/fixtures/syntax/classes/static/expected.js
@@ -3,7 +3,7 @@ var A = function() {
 
   Object.defineProperties(A, {
     a: {
-      writeable: true,
+      writable: true,
       value: function() {}
     },