diff --git a/mesecons_pistons/pistons_up.lua b/mesecons_pistons/pistons_up.lua
index 01675e0..b3f3261 100644
--- a/mesecons_pistons/pistons_up.lua
+++ b/mesecons_pistons/pistons_up.lua
@@ -3,7 +3,7 @@
 minetest.register_node("mesecons_pistons:piston_up_normal", {
 	description = "Piston UP",
 	tiles = {"jeija_piston_side.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png"},
-	groups = {cracky=3, mesecon_effector_on = 1, mesecon_effector_off = 1, mesecon = 2},
+	groups = {cracky=3, mesecon = 2},
 	after_dig_node = function(pos, oldnode)
 		local dir = {x=0, y=1, z=0}
 		pos.x, pos.y, pos.z = pos.x + dir.x, pos.y + dir.y, pos.z + dir.z --move to first node to check
@@ -24,7 +24,7 @@ mesecon:register_effector("mesecons_pistons:piston_up_normal", "mesecons_pistons
 minetest.register_node("mesecons_pistons:piston_up_sticky", {
 	description = "Sticky Piston UP",
 	tiles = {"jeija_piston_sticky_side.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png", "jeija_piston_tb.png"},
-	groups = {cracky=3, mesecon_effector_on = 1, mesecon_effector_off = 1, mesecon = 2},
+	groups = {cracky=3, mesecon = 2},
 	after_dig_node = function(pos, oldnode)
 		local dir = {x=0, y=1, z=0}
 		pos.x, pos.y, pos.z = pos.x + dir.x, pos.y + dir.y, pos.z + dir.z --move to first node to check