diff --git a/lib/6to5/transformation/transformer.js b/lib/6to5/transformation/transformer.js
index 853ddf142e..a8c189a8ea 100644
--- a/lib/6to5/transformation/transformer.js
+++ b/lib/6to5/transformation/transformer.js
@@ -3,7 +3,6 @@
 module.exports = Transformer;
 
 var TransformerPass = require("./transformer-pass");
-var traverse        = require("../traverse");
 var t               = require("../types");
 var _               = require("lodash");
 
diff --git a/lib/6to5/transformation/transformers/internal/module-formatter.js b/lib/6to5/transformation/transformers/internal/module-formatter.js
index 076c051160..f1a7c81c89 100644
--- a/lib/6to5/transformation/transformers/internal/module-formatter.js
+++ b/lib/6to5/transformation/transformers/internal/module-formatter.js
@@ -1,7 +1,6 @@
 "use strict";
 
 var useStrict = require("../../helpers/use-strict");
-var transform = require("../../transform");
 
 exports.ast = {
   exit: function (ast, file) {
diff --git a/lib/6to5/transformation/transformers/internal/modules-split.js b/lib/6to5/transformation/transformers/internal/modules-split.js
index b50c23878c..36d9701dc7 100644
--- a/lib/6to5/transformation/transformers/internal/modules-split.js
+++ b/lib/6to5/transformation/transformers/internal/modules-split.js
@@ -2,7 +2,7 @@
 
 var t = require("../../../types");
 
-exports.ExportDeclaration = function (node, parent, scope, context, file) {
+exports.ExportDeclaration = function (node) {
   var declar = node.declaration;
 
   if (node.default) {
diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index 1ab05aa607..57bfb767eb 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -162,7 +162,7 @@ TraversalContext.prototype.visit = function (node, key, opts, scope, state) {
   }
 };
 
-function traverseNode(node, opts, scope, state, debug) {
+function traverseNode(node, opts, scope, state) {
   var keys = t.VISITOR_KEYS[node.type];
   if (!keys) return;