diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 56d62e6c..554d8ff8 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -186,8 +186,7 @@ function suspend(co, result, command, param, size)
 			error(debug.traceback(co))
 		end
 		local f = param
-		local response
-		response = function(ok, ...)
+		local function response(ok, ...)
 			if ok == "TEST" then
 				if dead_service[co_address] then
 					release_watching(co_address)