diff --git a/lib/6to5/generation/node/index.js b/lib/6to5/generation/node/index.js
index 3ab36da9dd..b1ab6b7599 100644
--- a/lib/6to5/generation/node/index.js
+++ b/lib/6to5/generation/node/index.js
@@ -24,7 +24,7 @@ function Node(node, parent) {
 }
 
 Node.prototype.isUserWhitespacable = function () {
-  return t.isUserWhitespacable(node);
+  return t.isUserWhitespacable(this.node);
 };
 
 Node.prototype.needsWhitespace = function (type) {