diff --git a/lib/babel/transformation/transformers/es6/classes.js b/lib/babel/transformation/transformers/es6/classes.js
index 20df75660c..8ca8786924 100644
--- a/lib/babel/transformation/transformers/es6/classes.js
+++ b/lib/babel/transformation/transformers/es6/classes.js
@@ -84,9 +84,9 @@ ClassTransformer.prototype.run = function () {
     body.push(constructor);
   } else {
     var constructorName = null;
-    // when there is only constructor or nothing, constructor is not
-    // wrapped in closure and has to be named
-    if (this.node.body.body.length <= 1) {
+    // when class has no parent and there is only constructor or nothing then
+    // constructor is not wrapped in closure and has to be named
+    if (!this.hasSuper && this.node.body.body.length <= 1) {
       constructorName = className;
     }