diff --git a/2021/4/src/main.rs b/2021/4/src/main.rs
index 962dc2a..aa9235b 100644
--- a/2021/4/src/main.rs
+++ b/2021/4/src/main.rs
@@ -69,7 +69,7 @@ fn main() {
                     .len() > 0
             ).collect();
 
-        if winning_boards.len() == 1 {
+        if last_winning_boards.len() == 0 && winning_boards.len() == 1 {
             let sum: i32 = winning_boards
                 .iter()
                 .map(|(_, x)| x)