diff --git a/src/ajax.js b/src/ajax.js
index dd3c50d80..955856cc2 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -235,7 +235,7 @@ jQuery.extend({
 
 		// Utility function that handles dataType when response is received
 		// (for those transports that can give text or xml responses)
-		determineDataType: function( ct , text , xml ) {
+		determineResponse: function( responses , ct ) {
 
 			var s = this,
 				contents = s.contents,
@@ -246,7 +246,7 @@ jQuery.extend({
 				response;
 
 			// Auto (xml, json, script or text determined given headers)
-			if ( transportDataType === "*" ) {
+			if ( ct && transportDataType === "*" ) {
 
 				for ( type in contents ) {
 					if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
@@ -256,23 +256,22 @@ jQuery.extend({
 				}
 			}
 
-			// xml and parsed as such
-			if ( transportDataType === "xml" &&
-				xml &&
-				xml.documentElement /* #4958 */ ) {
-
-				response = xml;
-
-			// Text response was provided
-			} else {
-
-				response = text;
-
-				// If it's not really text, defer to converters
-				if ( transportDataType !== "text" ) {
-					dataTypes.unshift( "text" );
+			// Get response
+			for( type in responses ) {
+				if ( type === transportDataType ) {
+					break;
 				}
+			}
 
+			// Get final response
+			response = responses[ type ];
+
+			// If it's not the right dataType, handle the dataTypeList
+			if ( transportDataType !== type ) {
+				if ( transportDataType === "*" ) {
+					dataTypes.shift();
+				}
+				dataTypes.unshift( type );
 			}
 
 			return response;
diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index 4acb70054..cd9838c3b 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -12,8 +12,8 @@ var // Next active xhr id
 	// XHR used to determine supports properties
 	testXHR;
 
-// Create the request object; Microsoft failed to properly
-// (This is still attached to ajaxSettings for backward compatibility reasons)
+// Create the request object
+// (This is still attached to ajaxSettings for backward compatibility)
 jQuery.ajaxSettings.xhr = window.ActiveXObject ?
 	/* Microsoft failed to properly
 	 * implement the XMLHttpRequest in IE7 (can't request local files),
@@ -146,8 +146,9 @@ if ( jQuery.support.ajax ) {
 								// Get info
 								var status = xhr.status,
 									statusText,
-									response,
-									responseHeaders = xhr.getAllResponseHeaders();
+									responseHeaders = xhr.getAllResponseHeaders(),
+									responses = {},
+									xml = xhr.responseXML;
 
 								try { // Firefox throws an exception when accessing statusText for faulty cross-domain requests
 
@@ -184,15 +185,15 @@ if ( jQuery.support.ajax ) {
 												status
 										);
 
-								// Guess response & update dataType accordingly
-								response =
-									s.determineDataType(
-										xhr.getResponseHeader("content-type"),
-										xhr.responseText,
-										xhr.responseXML );
+								// Construct response list
+								if ( xml && xml.documentElement /* #4958 */ ) {
+									responses.xml = xml;
+								}
+								responses.text = xhr.responseText;
 
 								// Call complete
-								complete(status,statusText,response,responseHeaders);
+								complete(status,statusText,s.determineResponse( responses,
+										xhr.getResponseHeader( "content-type" ) ),responseHeaders);
 							}
 						}
 					};