diff --git a/mods/ufos/furnace.lua b/mods/ufos/furnace.lua
index 6e3d2a16..43931127 100644
--- a/mods/ufos/furnace.lua
+++ b/mods/ufos/furnace.lua
@@ -1,5 +1,5 @@
 
-ufos.fuel = "default:obsidian_shard"
+ufos.fuel = "default:lunarium_lump"
 ufos.fuel_time = 10
 
 ufos.furnace_inactive_formspec =