diff --git a/elixir/livebook/2024/day3.livemd b/elixir/livebook/2024/day3.livemd
index 8a2e79a..e0f0796 100644
--- a/elixir/livebook/2024/day3.livemd
+++ b/elixir/livebook/2024/day3.livemd
@@ -21,13 +21,12 @@ for instruction <- Regex.scan(
   input
 ), reduce: {true, 0} do
   {enabled?, acc} ->
-    (fn
-      false, ["mul" <> _ | _] -> {false, acc}
-      true, ["mul" <> _, _, a, b] -> {true, acc + String.to_integer(a) * String.to_integer(b)}
-      _, ["don" <> _ | _] -> {false, acc}
-      _, ["do()" | _] -> {true, acc}
+    case {enabled?, instruction} do
+      {false, ["mul" <> _ | _]} -> {false, acc}
+      {true, ["mul" <> _, _, a, b]} -> {true, acc + String.to_integer(a) * String.to_integer(b)}
+      {_, ["don" <> _ | _]} -> {false, acc}
+      {_, ["do()" | _]} -> {true, acc}
     end
-    ).(enabled?, instruction)
 end
 ```