diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 2dd38f8d..0bc2d6e9 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -446,12 +446,10 @@ function skynet.dispatch_unknown_response(unknown)
 	return prev
 end
 
-local tunpack = table.unpack
-
 function skynet.fork(func,...)
-	local args = { ... }
+	local args = table.pack(...)
 	local co = co_create(function()
-		func(tunpack(args))
+		func(table.unpack(args,1,args.n))
 	end)
 	table.insert(fork_queue, co)
 	return co