diff --git a/lib/aws.js b/lib/aws.js
index ee28416..f985be9 100644
--- a/lib/aws.js
+++ b/lib/aws.js
@@ -52,7 +52,7 @@ function genericAWSClient(obj) {
 
   return {call: call};
 
-  function call(action, query, callback) {
+  function call(action, query, host,callback) {
     // Wrap the callback to prevent it from being called multiple times.
     callback = (function(next) {
       var isCalled = false;