diff --git a/lib/6to5/transformation/transformers/es6-default-parameters.js b/lib/6to5/transformation/transformers/es6-default-parameters.js
index 3e942eb68c..acb29933d0 100644
--- a/lib/6to5/transformation/transformers/es6-default-parameters.js
+++ b/lib/6to5/transformation/transformers/es6-default-parameters.js
@@ -69,14 +69,14 @@ exports.Function = function (node, parent, scope, context, file) {
       continue;
     }
 
-    var def = util.template("default-parameter", {
+    var defNode = util.template("default-parameter", {
       VARIABLE_NAME: node.params[i],
       DEFAULT_VALUE: def,
       ARGUMENT_KEY:  t.literal(+i),
       ARGUMENTS:     argsIdentifier
     }, true);
-    def._blockHoist = node.defaults.length - i;
-    body.push(def);
+    defNode._blockHoist = node.defaults.length - i;
+    body.push(defNode);
   }
 
   // we need to cut off all trailing default parameters