diff --git a/lib/$.coffee b/lib/$.coffee
index 0bd4842b4..66211aefa 100644
--- a/lib/$.coffee
+++ b/lib/$.coffee
@@ -44,7 +44,7 @@ $.extend $,
     {type, headers, upCallbacks, form, sync} = opts
     r = new XMLHttpRequest()
     type or= form and 'post' or 'get'
-    r.open type, url, if sync then false else true
+    r.open type, url, !sync
     for key, val of headers
       r.setRequestHeader key, val
     $.extend r, callbacks