diff --git a/src/bin/04.rs b/src/bin/04.rs
index 1a9f6cc..d65ffcb 100644
--- a/src/bin/04.rs
+++ b/src/bin/04.rs
@@ -30,7 +30,6 @@ fn part2(input: &str) -> u64 {
     cards.iter().map(|card| card.copies).sum()
 }
 
-#[derive(Clone)]
 struct Card {
     copies: u64,
     winning: HashSet<u64>,