diff --git a/technic/machines/register/compressor_recipes.lua b/technic/machines/register/compressor_recipes.lua
index 2c405dd..777499f 100644
--- a/technic/machines/register/compressor_recipes.lua
+++ b/technic/machines/register/compressor_recipes.lua
@@ -45,17 +45,17 @@ end
 
 -- Clear recipes
 for _, craft_name in ipairs(crafts_to_clear) do
-	is_regular = string.sub(craft_name, 1, 7) ~= "nether:"
+	local is_regular = string.sub(craft_name, 1, 7) ~= "nether:"
 
 	if is_regular then
 		-- Regular compression recipes use 2x2 shape.
-		shaped_recipe = {
+		local shaped_recipe = {
 			{craft_name, craft_name},
 			{craft_name, craft_name},
 		}
 	else
 		-- Nether's compression recipes use 3x3 shape.
-		shaped_recipe = {
+		local shaped_recipe = {
 			{craft_name, craft_name, craft_name},
 			{craft_name, craft_name, craft_name},
 			{craft_name, craft_name, craft_name},