diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index 08fc175326..dd23674395 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -2,6 +2,7 @@
 
 var toFastProperties = require("../helpers/to-fast-properties");
 var esutils          = require("esutils");
+var object           = require("../helpers/object");
 var Node             = require("./node");
 var _                = require("lodash");
 
@@ -455,7 +456,7 @@ t.getIds = function (node, map, ignoreTypes) {
   ignoreTypes = ignoreTypes || [];
 
   var search = [].concat(node);
-  var ids    = {};
+  var ids    = object();
 
   while (search.length) {
     var id = search.shift();