diff --git a/lib/6to5/transformation/transformers/es6/parameters.default.js b/lib/6to5/transformation/transformers/es6/parameters.default.js
index 7d5bf97e92..c529f5a36e 100644
--- a/lib/6to5/transformation/transformers/es6/parameters.default.js
+++ b/lib/6to5/transformation/transformers/es6/parameters.default.js
@@ -25,7 +25,6 @@ exports.Function = function (node, parent, scope) {
 
   t.ensureBlock(node);
 
-  var iife = false;
   var body = [];
 
   var argsIdentifier = t.identifier("arguments");