diff --git a/tools.lua b/tools.lua
index fca8a03..740bf83 100644
--- a/tools.lua
+++ b/tools.lua
@@ -155,27 +155,29 @@ minetest.register_craft({
 
 if minetest.get_modpath("toolranks") then
 
-	function add_toolranks(name)
+	local function add_toolranks(name)
 		local nethertool_after_use = ItemStack(name):get_definition().after_use
 		toolranks.add_tool(name)
 		local toolranks_after_use  = ItemStack(name):get_definition().after_use
 
-		if (nethertool_after_use ~= nil and nethertool_after_use ~= toolranks_after_use) then
-			minetest.override_item(name, {
-				after_use = function(itemstack, user, node, digparams)
-					-- combine nethertool_after_use and toolranks_after_use by allowing
-					-- nethertool_after_use() to calculate the wear...
-					local initialWear = itemstack:get_wear()
-					itemstack = nethertool_after_use(itemstack, user, node, digparams)
-					local wear = itemstack:get_wear() - initialWear
-					itemstack:set_wear(initialWear) -- restore/undo the wear
-
-					-- ...and have toolranks_after_use() apply the wear.
-					digparams.wear = wear
-					return toolranks_after_use(itemstack, user, node, digparams)
-				end
-			})
+		if nethertool_after_use == nil or nethertool_after_use == toolranks_after_use then
+			return
 		end
+
+		minetest.override_item(name, {
+			after_use = function(itemstack, user, node, digparams)
+				-- combine nethertool_after_use and toolranks_after_use by allowing
+				-- nethertool_after_use() to calculate the wear...
+				local initial_wear = itemstack:get_wear()
+				itemstack = nethertool_after_use(itemstack, user, node, digparams)
+				local wear = itemstack:get_wear() - initial_wear
+				itemstack:set_wear(initial_wear) -- restore/undo the wear
+
+				-- ...and have toolranks_after_use() apply the wear.
+				digparams.wear = wear
+				return toolranks_after_use(itemstack, user, node, digparams)
+			end
+		})
 	end
 
 	add_toolranks("nether:pick_nether")