diff --git a/lib/6to5/transformation/helpers/replace-supers.js b/lib/6to5/transformation/helpers/replace-supers.js
index ef4b4a250e..c3fb9a119d 100644
--- a/lib/6to5/transformation/helpers/replace-supers.js
+++ b/lib/6to5/transformation/helpers/replace-supers.js
@@ -2,8 +2,7 @@
 
 module.exports = ReplaceSupers;
 
-var util = require("../../util");
-var t    = require("../../types");
+var t = require("../../types");
 
 /**
  * Description
diff --git a/lib/6to5/transformation/transformers/es6/object-super.js b/lib/6to5/transformation/transformers/es6/object-super.js
index 2ae32ef931..002eb1dfbd 100644
--- a/lib/6to5/transformation/transformers/es6/object-super.js
+++ b/lib/6to5/transformation/transformers/es6/object-super.js
@@ -1,10 +1,9 @@
 "use strict";
 
 var ReplaceSupers = require("../../helpers/replace-supers");
-var util          = require("../../../util");
 var t             = require("../../../types");
 
-exports.check = function (node, parent) {
+exports.check = function (node) {
   return t.isIdentifier(node, { name: "super" });
 };