diff --git a/src/loader/XHRSettings.js b/src/loader/XHRSettings.js
index f32678477..e1acf1e71 100644
--- a/src/loader/XHRSettings.js
+++ b/src/loader/XHRSettings.js
@@ -45,6 +45,7 @@ var XHRSettings = function (responseType, async, user, password, timeout)
         timeout: timeout,
 
         //  setRequestHeader
+        headers: undefined,
         header: undefined,
         headerValue: undefined,
         requestedWith: false,