diff --git a/mods/MAPGEN/mcl_biomes/init.lua b/mods/MAPGEN/mcl_biomes/init.lua
index b3b825071..11e97543a 100644
--- a/mods/MAPGEN/mcl_biomes/init.lua
+++ b/mods/MAPGEN/mcl_biomes/init.lua
@@ -4587,7 +4587,7 @@ local function register_decorations()
 	--Mushrooms in caves
 	minetest.register_decoration({
 		deco_type = "simple",
-		place_on = {"group:material_stone"},
+		place_on = {"mcl_core:stone"},
 		sidelen = 80,
 		fill_ratio = 0.009,
 		noise_threshold = 2.0,
@@ -4598,7 +4598,7 @@ local function register_decorations()
 	})
 	minetest.register_decoration({
 		deco_type = "simple",
-		place_on = {"group:material_stone"},
+		place_on = {"mcl_core:stone"},
 		sidelen = 80,
 		fill_ratio = 0.009,
 		noise_threshold = 2.0,