diff --git a/hot-metals/data.lua b/hot-metals/data.lua
index 1eb128b..aa33894 100644
--- a/hot-metals/data.lua
+++ b/hot-metals/data.lua
@@ -10,6 +10,8 @@ HotMetals = {
     skipTechUnlocksFor = {}
 }
 
+require("__cf-lib__/util")
+
 if settings.startup["hot-metals-plastic"].value then
     table.insert(HotMetals.items, "plastic-bar")
     if not mods["space-age"] then -- Space age uses other crafting categories