diff --git a/lib/6to5/transformation/modules/common.js b/lib/6to5/transformation/modules/common.js
index c59d512248..d75a7f8dd9 100644
--- a/lib/6to5/transformation/modules/common.js
+++ b/lib/6to5/transformation/modules/common.js
@@ -7,7 +7,7 @@ var util             = require("../../util");
 var t                = require("../../types");
 var contains         = require("lodash/collection/contains");
 
-function CommonJSFormatter(file) {
+function CommonJSFormatter() {
   DefaultFormatter.apply(this, arguments);
 }