diff --git a/lualib/socket.lua b/lualib/socket.lua
index 5ea222e0..d7741b54 100644
--- a/lualib/socket.lua
+++ b/lualib/socket.lua
@@ -407,8 +407,6 @@ end
 
 ---------------------- UDP
 
-local udp_socket = {}
-
 local function create_udp_object(id, cb)
 	assert(not socket_pool[id], "socket is not closed")
 	socket_pool[id] = {