diff --git a/day4/day4part2.exs b/day4/day4part2.exs
index 0b0b780..138b32a 100644
--- a/day4/day4part2.exs
+++ b/day4/day4part2.exs
@@ -10,8 +10,8 @@ defmodule Day4Part2 do
       |> String.split([" ", "\n"])
       |> Enum.map(&String.split(&1, ":"))
       |> Map.new(fn [k, v] -> {k, v} end)
+      |> Map.delete("cid")
     end)
-    |> Enum.map(&Map.delete(&1, "cid"))
     |> Enum.filter(&MapSet.subset?(@required, &1 |> Map.keys() |> MapSet.new()))
     |> Enum.count(&valid?/1)
     |> IO.puts()