diff --git a/2024/rust/src/day3.rs b/2024/rust/src/day3.rs
index d457bf7..8bad0a2 100644
--- a/2024/rust/src/day3.rs
+++ b/2024/rust/src/day3.rs
@@ -119,6 +119,12 @@ mod tests {
         assert_eq!(
             sum_muls("xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"),
             161
-        )
+        );
+        assert_eq!(
+            sum_muls_with_do_and_dont(
+                "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))"
+            ),
+            48
+        );
     }
 }