diff --git a/lib/6to5/file.js b/lib/6to5/file.js
index 1780dff724..994fc344d5 100644
--- a/lib/6to5/file.js
+++ b/lib/6to5/file.js
@@ -316,7 +316,7 @@ File.prototype.parse = function (code) {
   var opts = this.opts;
 
   opts.allowImportExportEverywhere = this.isLoose("es6.modules");
-  opts.strictMode = this.transformers.useStrict.canRun();
+  //opts.strictMode = this.transformers.useStrict.canRun();
 
   return util.parse(opts, code, function (tree) {
     self.transform(tree);