diff --git a/lib/6to5/transform.js b/lib/6to5/transform.js
index e5fdbd717e..f27d3d0fbb 100644
--- a/lib/6to5/transform.js
+++ b/lib/6to5/transform.js
@@ -1,7 +1,5 @@
 var traverse = require("./traverse");
-var assert   = require("assert");
 var recast   = require("recast");
-var path     = require("path");
 var util     = require("./util");
 var _        = require("lodash");
 
diff --git a/lib/6to5/transformers/for-of.js b/lib/6to5/transformers/for-of.js
index cada83ad2f..30f4fd8d97 100644
--- a/lib/6to5/transformers/for-of.js
+++ b/lib/6to5/transformers/for-of.js
@@ -1,5 +1,4 @@
 var util = require("../util");
-var b    = require("ast-types").builders;
 
 exports.ForOfStatement = function (node, parent, opts, generateUid) {
   var left = node.left;
diff --git a/lib/6to5/transformers/unicode-regex.js b/lib/6to5/transformers/unicode-regex.js
index b821cf3edb..0866a4f6fe 100644
--- a/lib/6to5/transformers/unicode-regex.js
+++ b/lib/6to5/transformers/unicode-regex.js
@@ -6,7 +6,7 @@ exports.Literal = function (node) {
   var regex = node.regex;
   if (!regex) return;
 
-  var flags = regex.flags.split("")
+  var flags = regex.flags.split("");
   if (!_.contains(regex.flags, "u")) return;
   _.pull(flags, "u");
 
diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index b1dc2d2549..8d5c1f33f7 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -44,7 +44,7 @@ exports.errorWithNode = function (node, msg) {
 };
 
 exports.camelCase = function (value) {
-  return value.replace(/[-_\s]+(.)?/g, function (match, c){
+  return value.replace(/[-_\s]+(.)?/g, function (match, c) {
     return c ? c.toUpperCase() : "";
   });
 };
@@ -175,7 +175,7 @@ exports.generate = function (ast, opts) {
   return recast.print(ast, printOpts);
 };
 
-exports.parse = function (filename, code, callback, opts) {
+exports.parse = function (filename, code, callback) {
   try {
     var ast = recast.parse(code, {
       sourceFileName: path.basename(filename)
@@ -218,8 +218,6 @@ try {
     var loc  = templatesLoc + "/" + name;
     var code = fs.readFileSync(loc, "utf8");
 
-    exports.templates[key] = exports.removeProperties(exports.parse(loc, code, null, {
-      tolerant: true
-    }).program);
+    exports.templates[key] = exports.removeProperties(exports.parse(loc, code).program);
   });
 }