diff --git a/lib/simpledb.js b/lib/simpledb.js
index 965aa7b..9348e4d 100644
--- a/lib/simpledb.js
+++ b/lib/simpledb.js
@@ -180,7 +180,7 @@ exports.SimpleDB = function(opts,logger) {
           // remove previous Signature from previous attempts
           delete q.Signature
 
-          self.client.call(act,q,function(res){
+          self.client.call(act,q,function(err, res){
             self.handle(start,act,q,tryI,last,res,stop,handler)
           })
         },