diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index b3d838ad0d..499ef4d234 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -52,11 +52,6 @@ exports.isAbsolute = function (loc) {
   return false;
 };
 
-exports.canCompile = function (filename) {
-  var ext = path.extname(filename);
-  return _.contains([".js", ".es6"], ext);
-};
-
 exports.sourceMapToComment = function (map) {
   var json = JSON.stringify(map);
   var base64 = new Buffer(json).toString("base64");