diff --git a/exp_scenario/module/commands/waterfill.lua b/exp_scenario/module/commands/waterfill.lua
index ef4c57b7..0603e613 100644
--- a/exp_scenario/module/commands/waterfill.lua
+++ b/exp_scenario/module/commands/waterfill.lua
@@ -72,13 +72,14 @@ Selection.on_selection(SelectionName, function(event)
 
     surface.set_tiles(tiles_to_make, true, "abort_on_collision", true, false, player, 0)
     local remaining_tiles = surface.count_tiles_filtered{ area = area, name = "water-mud" }
+    local t_diff = tile_count - remaining_tiles
 
     if item_count_type_bool then
-        player.remove_item{ name = "cliff-explosives", count = tile_count - remaining_tiles }
+        player.remove_item{ name = "cliff-explosives", count = t_diff }
     else
-        player.remove_item{ name = "explosives", count = 10 * (tile_count - remaining_tiles) }
-        player.remove_item{ name = "barrel", count = tile_count - remaining_tiles }
-        player.remove_item{ name = "grenade", count = tile_count - remaining_tiles }
+        player.remove_item{ name = "explosives", count = 10 * t_diff }
+        player.remove_item{ name = "barrel", count = t_diff }
+        player.remove_item{ name = "grenade", count = t_diff }
     end
 
     if remaining_tiles > 0 then