diff --git a/technic/register.lua b/technic/register.lua
index 288db57..0b55282 100644
--- a/technic/register.lua
+++ b/technic/register.lua
@@ -44,7 +44,14 @@ end
 
 -- Wear down a tool depending on the remaining charge.
 function technic.set_RE_wear(itemstack, item_load, max_load)
-	local temp = 65536 - math.floor(item_load / max_load * 65535)
+	local temp
+	if item_load == 0 then
+		temp = 0
+	else
+		temp = 65536 - math.floor(item_load / max_load * 65535)
+		if temp > 65535 then temp = 65535 end
+		if temp < 1 then temp = 1 end
+	end
 	itemstack:set_wear(temp)
 	return itemstack
 end
diff --git a/technic/tools/mining_lasers.lua b/technic/tools/mining_lasers.lua
index b80e878..4a4ed2f 100644
--- a/technic/tools/mining_lasers.lua
+++ b/technic/tools/mining_lasers.lua
@@ -178,7 +178,6 @@ for _, m in pairs(mining_lasers_list) do
 			if meta.charge >= m[4] then
 				meta.charge = meta.charge - m[4]
 				laser_shoot(user, m[2], "technic_laser_beam_mk"..m[1]..".png", "technic_laser_mk"..m[1])
-				meta.charge = meta.charge - 400
 				technic.set_RE_wear(itemstack, meta.charge, m[3])
 				itemstack:set_metadata(minetest.serialize(meta))
 			end