diff --git a/basic_machines/constructor.lua b/basic_machines/constructor.lua
index afeb95a..b7e1289 100644
--- a/basic_machines/constructor.lua
+++ b/basic_machines/constructor.lua
@@ -124,7 +124,7 @@ end
 minetest.register_node("basic_machines:constructor", {
 	description = "Constructor: used to make machines",
 	tiles = {"constructor.png"},
-	groups = {cracky=3, mesecon_effector_on = 1},
+	groups = {cracky=3, mesecon_effector_on = 1, tubedevice = 1, tubedevice_receiver = 1},
 	sounds = default.node_sound_wood_defaults(),
 	after_place_node = function(pos, placer)
 		local meta = minetest.get_meta(pos);