diff --git a/lib/6to5/traversal/scope.js b/lib/6to5/traversal/scope.js
index d8190a282d..c446a69f19 100644
--- a/lib/6to5/traversal/scope.js
+++ b/lib/6to5/traversal/scope.js
@@ -33,7 +33,7 @@ function Scope(block, parentBlock, parent, file) {
   this.crawl();
 }
 
-Scope.defaultDeclarations = flatten([globals.builtin, globals.browser, globals.node].map(Object.keys));
+Scope.globals = flatten([globals.builtin, globals.browser, globals.node].map(Object.keys));
 
 /**
  * Description
@@ -403,6 +403,8 @@ Scope.prototype.addGlobal = function (node) {
 };
 
 Scope.prototype.hasGlobal = function (name) {
+  if (includes(Scope.globals, name)) return true;
+
   var scope = this;
 
   do {
@@ -637,7 +639,6 @@ Scope.prototype.hasBinding = function (name) {
   if (!name) return false;
   if (this.hasOwnBinding(name)) return true;
   if (this.parentHasBinding(name)) return true;
-  if (includes(Scope.defaultDeclarations, name)) return true;
   return false;
 };