diff --git a/mods/default/functions.lua b/mods/default/functions.lua
index 9e29f1f..2f08d70 100644
--- a/mods/default/functions.lua
+++ b/mods/default/functions.lua
@@ -93,7 +93,7 @@ default.cool_lava_source = function(pos)
 end
 
 default.cool_lava_flowing = function(pos)
-	minetest.set_node(pos, {name="default:stone"})
+	minetest.set_node(pos, {name="default:cobble"})
 	minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
 end