diff --git a/lib/mock-ajax.js b/lib/mock-ajax.js
index 0446769..b54d158 100644
--- a/lib/mock-ajax.js
+++ b/lib/mock-ajax.js
@@ -278,7 +278,6 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
         this.username = arguments[3];
         this.password = arguments[4];
         this.readyState = 1;
-        this.requestHeaders = {};
         this.eventBus.trigger('readystatechange');
       },