diff --git a/mesecons_wires/init.lua b/mesecons_wires/init.lua
index c7669b3..9eb1b58 100644
--- a/mesecons_wires/init.lua
+++ b/mesecons_wires/init.lua
@@ -123,8 +123,7 @@ local selectionbox =
 }
 
 -- go to the next nodeid (ex.: 01000011 --> 01000100)
-local nid_inc = function() end
-nid_inc = function (nid)
+local nid_inc = function (nid)
 	local i = 0
 	while nid[i-1] ~= 1 do
 		nid[i] = (nid[i] ~= 1) and 1 or 0