diff --git a/mods/farming/api.lua b/mods/farming/api.lua
index c892a779..414ebc0f 100644
--- a/mods/farming/api.lua
+++ b/mods/farming/api.lua
@@ -66,7 +66,7 @@ farming.hoe_on_use = function(itemstack, user, pointed_thing, uses)
 	if not minetest.is_creative_enabled(player_name) then
 		-- wear tool
 		local wdef = itemstack:get_definition()
-		itemstack:add_wear(65535/(uses-1))
+		itemstack:add_wear_by_uses(uses)
 		-- tool break sound
 		if itemstack:get_count() == 0 and wdef.sound and wdef.sound.breaks then
 			minetest.sound_play(wdef.sound.breaks, {pos = pt.above,
diff --git a/mods/fire/init.lua b/mods/fire/init.lua
index 030b604d..3069aa80 100644
--- a/mods/fire/init.lua
+++ b/mods/fire/init.lua
@@ -114,7 +114,7 @@ minetest.register_tool("fire:flint_and_steel", {
 		if not minetest.is_creative_enabled(player_name) then
 			-- Wear tool
 			local wdef = itemstack:get_definition()
-			itemstack:add_wear(1000)
+			itemstack:add_wear_by_uses(66)
 
 			-- Tool break sound
 			if itemstack:get_count() == 0 and wdef.sound and wdef.sound.breaks then
diff --git a/mods/fireflies/init.lua b/mods/fireflies/init.lua
index 59a40c54..5593afe4 100644
--- a/mods/fireflies/init.lua
+++ b/mods/fireflies/init.lua
@@ -108,7 +108,7 @@ minetest.register_tool("fireflies:bug_net", {
 			end
 		end
 		if not minetest.is_creative_enabled(player_name) then
-			itemstack:add_wear(256)
+			itemstack:add_wear_by_uses(256)
 			return itemstack
 		end
 	end
diff --git a/mods/screwdriver/init.lua b/mods/screwdriver/init.lua
index 98548f0b..48684cfb 100644
--- a/mods/screwdriver/init.lua
+++ b/mods/screwdriver/init.lua
@@ -141,7 +141,7 @@ screwdriver.handler = function(itemstack, user, pointed_thing, mode, uses)
 	end
 
 	if not minetest.is_creative_enabled(player_name) then
-		itemstack:add_wear(65535 / ((uses or 200) - 1))
+		itemstack:add_wear_by_uses(uses or 200)
 	end
 
 	return itemstack