diff --git a/api.lua b/api.lua
index 3f61e4c..14e8347 100644
--- a/api.lua
+++ b/api.lua
@@ -37,6 +37,8 @@ function carpets.register(recipe, def)
 		node.tiles = {node.tiles[6]}
 	end
 	node.groups.leafdecay = nil
+	node.material = recipe
+	node.formation = "carpet"
 
 	if config:get_bool("FallingCarpet") and node.groups.falling_node == nil then
 		node.groups.falling_node = 1
diff --git a/init.lua b/init.lua
index 8269abb..709fec5 100644
--- a/init.lua
+++ b/init.lua
@@ -19,6 +19,11 @@ local function filter(name, def)
 		return false
 	end
 
+	-- no 3rd hand carpets
+	if def.material then
+		return false
+	end
+
 	-- not supported node types for carpets
 	if def.drawtype == "liquid"    or
 	   def.drawtype == "firelike"  or