diff --git a/stairsplus/conversion.lua b/stairsplus/conversion.lua
index 1c8981b..37f2a25 100644
--- a/stairsplus/conversion.lua
+++ b/stairsplus/conversion.lua
@@ -80,6 +80,7 @@ function stairsplus:register_6dfacedir_conversion(modname, material)
 			chance = 1,
 			action = function(pos, node, active_object_count, active_object_count_wider)
 				local fdir = node.param2 or 0
+				local nfdir
 
 				if flip_upside_down and not flip_to_wall then
 					nfdir = dirs1[fdir + 2]