diff --git a/src/ajax.js b/src/ajax.js
index 5c4d469f..3eb36c3a 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -175,11 +175,12 @@ jQuery.extend({
 		timeout: 0,
 		data: null,
 		dataType: null,
-		dataTypes: null,
 		username: null,
 		password: null,
 		cache: null,
 		traditional: false,
+		headers: {},
+		crossDomain: null,
 		*/
 		xhr: function() {
 			return new window.XMLHttpRequest();