diff --git a/mods/ITEMS/mcl_farming/hoes.lua b/mods/ITEMS/mcl_farming/hoes.lua
index 8d9aa61ce..d94ea6f8e 100644
--- a/mods/ITEMS/mcl_farming/hoes.lua
+++ b/mods/ITEMS/mcl_farming/hoes.lua
@@ -119,7 +119,7 @@ minetest.register_tool("mcl_farming:hoe_stone", {
 		damage_groups = { fleshy = 1, },
 		punch_attack_uses = uses.stone,
 	},
-	_repair_material = "mcl_core:cobble",
+	_repair_material = "group:cobble",
 	_mcl_toollike_wield = true,
 	_mcl_diggroups = {
 		hoey = { speed = 4, level = 3, uses = 132 }
diff --git a/mods/ITEMS/mcl_tools/init.lua b/mods/ITEMS/mcl_tools/init.lua
index 48515dc3c..cbee8e3d0 100644
--- a/mods/ITEMS/mcl_tools/init.lua
+++ b/mods/ITEMS/mcl_tools/init.lua
@@ -110,7 +110,7 @@ minetest.register_tool("mcl_tools:pick_stone", {
 		punch_attack_uses = 66,
 	},
 	sound = { breaks = "default_tool_breaks" },
-	_repair_material = "mcl_core:cobble",
+	_repair_material = "group:cobble",
 	_mcl_toollike_wield = true,
 	_mcl_diggroups = {
 		pickaxey = { speed = 4, level = 3, uses = 132 }
@@ -283,7 +283,7 @@ minetest.register_tool("mcl_tools:shovel_stone", {
 	},
 	on_place = make_grass_path,
 	sound = { breaks = "default_tool_breaks" },
-	_repair_material = "mcl_core:cobble",
+	_repair_material = "group:cobble",
 	_mcl_toollike_wield = true,
 	_mcl_diggroups = {
 		shovely = { speed = 4, level = 3, uses = 132 }
@@ -417,7 +417,7 @@ minetest.register_tool("mcl_tools:axe_stone", {
 	},
 	on_place = make_stripped_trunk,
 	sound = { breaks = "default_tool_breaks" },
-	_repair_material = "mcl_core:cobble",
+	_repair_material = "group:cobble",
 	_mcl_toollike_wield = true,
 	_mcl_diggroups = {
 		axey = { speed = 4, level = 3, uses = 132 }
@@ -520,7 +520,7 @@ minetest.register_tool("mcl_tools:sword_stone", {
 		punch_attack_uses = 132,
 	},
 	sound = { breaks = "default_tool_breaks" },
-	_repair_material = "mcl_core:cobble",
+	_repair_material = "group:cobble",
 	_mcl_toollike_wield = true,
 	_mcl_diggroups = {
 		swordy = { speed = 4, level = 3, uses = 132 },