diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index 1b40721c2c..55da05b75b 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -70,9 +70,9 @@ each(t.FLIPPED_ALIAS_KEYS, function (types, type) {
  */
 
 t.is = function (type, node, opts, skipAliasCheck) {
-  if (!node) return;
+  if (!node) return false;
 
-  var typeMatches = (type === node.type);
+  var typeMatches = type === node.type;
 
   if (!typeMatches && !skipAliasCheck) {
     var aliases = t.FLIPPED_ALIAS_KEYS[type];