diff --git a/spec_bomb.lua b/spec_bomb.lua
index bbe9935..7845bb2 100644
--- a/spec_bomb.lua
+++ b/spec_bomb.lua
@@ -1,4 +1,4 @@
-local function disintigrate(pos, radius, node_name, user, dropped)
+local function disintigrate(pos, radius, node_name, user_name, dropped)
 	local node_id = minetest.get_content_id(node_name)
 	local air = minetest.get_content_id('air')
 	local minp = vector.subtract(pos, radius)
@@ -17,7 +17,7 @@ local function disintigrate(pos, radius, node_name, user, dropped)
 			local ivm = area:index(minp.x, y, z)
 			for x = minp.x, maxp.x do
 				p.x = x
-				if data[ivm] == node_id and not minetest.is_protected(p, user) then
+				if data[ivm] == node_id and not minetest.is_protected(p, user_name) then
 					data[ivm] = air
 					count = count + 1
 					if count % 50 == 0 then
@@ -49,7 +49,7 @@ local function disintigrate(pos, radius, node_name, user, dropped)
 end
 
 
-local function floor(pos, blocks, node_name, user)
+local function floor(pos, blocks, node_name, user_name)
 	local p = {y = pos.y}
 	local count = 0
 	for r = 1, blocks do
@@ -59,7 +59,7 @@ local function floor(pos, blocks, node_name, user)
 				p.x = pos.x + x
 				local node = minetest.get_node_or_nil(p)
 
-				if node and node.name == 'air' and not minetest.is_protected(p, user) then
+				if node and node.name == 'air' and not minetest.is_protected(p, user_name) then
 					minetest.set_node(p, {name = node_name})
 					count = count + 1
 					if count > blocks then