diff --git a/lib/6to5/transformation/transformers/es6-computed-property-names.js b/lib/6to5/transformation/transformers/es6-computed-property-names.js
index f84a522086..c6f85be62f 100644
--- a/lib/6to5/transformation/transformers/es6-computed-property-names.js
+++ b/lib/6to5/transformation/transformers/es6-computed-property-names.js
@@ -56,14 +56,15 @@ var loose = function (node, body, objId) {
 
 var spec = function (node, body, objId, initProps, file) {
   var props = node.properties;
+  var prop, key;
 
   // normalise key
 
   for (var i in props) {
-    var prop = props[i];
+    prop = props[i];
     if (prop.kind !== "init") continue;
 
-    var key = prop.key;
+    key = prop.key;
 
     if (!prop.computed && t.isIdentifier(key)) {
       prop.key = t.literal(key.name);