diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua
index 4ae48ece..115eb2cd 100644
--- a/mods/default/nodes.lua
+++ b/mods/default/nodes.lua
@@ -4,7 +4,8 @@ minetest.register_node("default:stone", {
 	description = "Stone",
 	tiles = {"default_stone.png"},
 	is_ground_content = true,
-	groups = {cracky=3, stone=1},
+	groups = {cracky=3, stone=1, melt=3000},
+	freezemelt = "default:lava_source",
 	drop = 'default:cobble',
 	legacy_mineral = true,
 	sounds = default.node_sound_stone_defaults(),
@@ -14,7 +15,8 @@ minetest.register_node("default:desert_stone", {
 	description = "Desert Stone",
 	tiles = {"default_desert_stone.png"},
 	is_ground_content = true,
-	groups = {cracky=3, stone=1},
+	groups = {cracky=3, stone=1, melt=3000},
+	freezemelt = "default:lava_source",
 	drop = 'default:desert_stone',
 	legacy_mineral = true,
 	sounds = default.node_sound_stone_defaults(),
@@ -1098,7 +1100,8 @@ minetest.register_node("default:obsidian", {
 	tiles = {"default_obsidian.png"},
 	is_ground_content = true,
 	sounds = default.node_sound_stone_defaults(),
-	groups = {cracky=1,level=2},
+	groups = {cracky=1,level=2, melt=5000},
+	freezemelt = "default:lava_source",
 })
 
 minetest.register_node("default:nyancat", {