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