diff --git a/lib/6to5/transformation/transformers/es6-classes.js b/lib/6to5/transformation/transformers/es6-classes.js
index 0d39bdc565..c6ea9505de 100644
--- a/lib/6to5/transformation/transformers/es6-classes.js
+++ b/lib/6to5/transformation/transformers/es6-classes.js
@@ -68,9 +68,6 @@ Class.prototype.run = function () {
 
     if (!t.isIdentifier(superName)) {
       var superRef = this.scope.generateUidBasedOnNode(superName, this.file);
-      body.unshift(t.variableDeclaration("var", [
-        t.variableDeclarator(superRef, superName)
-      ]));
       superName = superRef;
     }