diff --git a/lib/6to5/transformation/transformers/es6/tail-call.js b/lib/6to5/transformation/transformers/es6/tail-call.js
index e18b8c319a..9ebf682220 100644
--- a/lib/6to5/transformation/transformers/es6/tail-call.js
+++ b/lib/6to5/transformation/transformers/es6/tail-call.js
@@ -84,6 +84,8 @@ var functionVisitor = {
 
 exports.FunctionDeclaration =
 exports.FunctionExpression = function (node, parent, scope, file) {
+  return;
+
   var tempId, helperRef;
 
   var state = {