diff --git a/lib/6to5/index.js b/lib/6to5/index.js
index c88d7dcf47..2585aab36d 100644
--- a/lib/6to5/index.js
+++ b/lib/6to5/index.js
@@ -1,5 +1,5 @@
 var transform = require("./transformation/transform");
-var path      = require("path");
+var util      = require("./util");
 var fs        = require("fs");
 var _         = require("lodash");
 
@@ -15,11 +15,7 @@ exports.polyfill = function () {
   require("./polyfill");
 };
 
-exports.canCompile = function (filename, altExts) {
-  var exts = altExts || [".js", ".jsx", ".es6"];
-  var ext = path.extname(filename);
-  return _.contains(exts, ext);
-};
+exports.canCompile = util.canCompile;
 
 exports.transform = transform;
 
diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index ae267180dd..b3d838ad0d 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -11,6 +11,12 @@ var _          = require("lodash");
 
 exports.inherits = util.inherits;
 
+exports.canCompile = function (filename, altExts) {
+  var exts = altExts || [".js", ".jsx", ".es6"];
+  var ext = path.extname(filename);
+  return _.contains(exts, ext);
+};
+
 exports.resolve = function (loc) {
   try {
     return require.resolve(loc);