diff --git a/cooling_lava.lua b/cooling_lava.lua
index e15efb9..d33b83f 100644
--- a/cooling_lava.lua
+++ b/cooling_lava.lua
@@ -198,8 +198,10 @@ local cool_lava_source = function(pos, node)
 	elseif #evaporate_list > 0 then
 		-- Again, this weird bit is necessary for breaking certain types of flow deadlock
 		local loc = evaporate_list[math.random(1,#evaporate_list)]
-		minetest.set_node(pos, {name = "air"})
-		minetest.set_node(loc, {name = "default:lava_source"})
+		if loc.y <= pos.y then
+			minetest.set_node(pos, {name = "air"})
+			minetest.set_node(loc, {name = "default:lava_source"})
+		end
 	end
 	
 	minetest.sound_play("default_cool_lava",