diff --git a/lib/6to5/transformation/transformers/es6-classes.js b/lib/6to5/transformation/transformers/es6-classes.js
index 1259e39f31..1bffd19f76 100644
--- a/lib/6to5/transformation/transformers/es6-classes.js
+++ b/lib/6to5/transformation/transformers/es6-classes.js
@@ -136,7 +136,7 @@ Class.prototype.buildBody = function () {
   for (var i in classBody) {
     var node = classBody[i];
     if (t.isMethodDefinition(node)) {
-      this.replaceInstanceSuperReferences(node);
+      this.replaceSuperReferences(node);
 
       if (node.key.name === "constructor") {
         this.pushConstructor(node);
@@ -301,7 +301,7 @@ Class.prototype.looseSuperProperty = function (methodNode, id, parent) {
  * @param {Node} methodNode MethodDefinition
  */
 
-Class.prototype.replaceInstanceSuperReferences = function (methodNode) {
+Class.prototype.replaceSuperReferences = function (methodNode) {
   var method = methodNode.value;
   var self   = this;
 
@@ -324,6 +324,11 @@ Class.prototype.replaceInstanceSuperReferences = function (methodNode) {
           return this.skip();
         }
 
+        if (t.isProperty(node, { method: true }) || t.isMethodDefinition(node)) {
+          // break on object methods
+          return this.skip();
+        }
+
         var getThisReference = function () {
           if (topLevel) {
             // top level so `this` is the instance