diff --git a/init.lua b/init.lua
index 8118678..c6accb6 100644
--- a/init.lua
+++ b/init.lua
@@ -97,6 +97,7 @@ minetest.register_tool("returnmirror:mirror_inactive", {
 	inventory_image = "returnmirror_mirror_inactive.png",
 	wield_image = "returnmirror_mirror_inactive.png",
 	tool_capabilities = {},
+	groups = { disable_repair = 1 },
 	range = 2,
 	on_use = function(itemstack, user, pointed_thing)
 		minetest.sound_play( {name="returnmirror_fail", gain=1}, {pos=user:getpos(), max_hear_distance=18})
@@ -112,6 +113,7 @@ minetest.register_tool("returnmirror:mirror_active", {
 	inventory_image = "returnmirror_mirror_active.png",
 	wield_image = "returnmirror_mirror_active.png",
 	tool_capabilities = {},
+	groups = { disable_repair = 1 },
 	range = 2,
 	on_use = function(itemstack, user, pointed_thing)
 		local dest_string = itemstack:get_metadata()