diff --git a/src/helpers/expose_getters_from.js b/src/helpers/expose_getters_from.js
index bcad9ac8..2d67b7a3 100644
--- a/src/helpers/expose_getters_from.js
+++ b/src/helpers/expose_getters_from.js
@@ -1,9 +1,9 @@
 "use strict";
 
 module.exports = function (component, prototype, instance) {
-  Object.keys(prototype).forEach(function (key) {
+  for (var key in prototype) {
     if (key.match(/^get/) && !key.match(/Map$/)) {
       component[key] = instance[key].bind(instance);
     }
-  });
+  }
 };