diff --git a/core-ajax.html b/core-ajax.html
index c0ca0ad..ae8b741 100644
--- a/core-ajax.html
+++ b/core-ajax.html
@@ -236,7 +236,7 @@
 
     isSuccess: function(xhr) {
       var status = xhr.status || 0;
-      return !status || (status >= 200 && status < 300);
+      return status >= 200 && status < 300;
     },
 
     processResponse: function(xhr) {