diff --git a/lualib/sproto.lua b/lualib/sproto.lua
index 3ae114bd..00f5337b 100644
--- a/lualib/sproto.lua
+++ b/lualib/sproto.lua
@@ -180,9 +180,10 @@ end
 local header_tmp = {}
 
 local function gen_response(self, response, session)
-	return function(args)
+	return function(args, ud)
 		header_tmp.type = nil
 		header_tmp.session = session
+		header_tmp.ud = ud
 		local header = core.encode(self.__package, header_tmp)
 		if response then
 			local content = core.encode(response, args)