diff --git a/src/system-fetch.js b/src/system-fetch.js
index 9e38bef..e20f21b 100644
--- a/src/system-fetch.js
+++ b/src/system-fetch.js
@@ -33,7 +33,7 @@
         fulfill(xhr.responseText);
       }
       function error() {
-        reject(new Error(xhr.statusText + ': ' + url || 'XHR error'));
+        reject(new Error('XHR error: status ' + xhr.status + ' "' + xhr.statusText + '": ' + url));
       }
 
       xhr.onreadystatechange = function () {