diff --git a/lib/6to5/file.js b/lib/6to5/file.js
index 7d15509388..597482a798 100644
--- a/lib/6to5/file.js
+++ b/lib/6to5/file.js
@@ -48,7 +48,6 @@ File.normaliseOptions = function (opts) {
 
   _.defaults(opts, {
     keepModuleIdExtensions: false,
-    includeRegenerator:     false,
     experimental:           false,
     reactCompat:            false,
     playground:             false,