diff --git a/aoc_2024/src/day7.rs b/aoc_2024/src/day7.rs
index 678b16a..999ce68 100644
--- a/aoc_2024/src/day7.rs
+++ b/aoc_2024/src/day7.rs
@@ -34,7 +34,7 @@ fn part1_test(target: i64, remaining: i64, numbers: &[u64]) -> bool {
         let num = numbers[numbers.len() - 1] as i64;
         let rest = &numbers[0..numbers.len() - 1];
         let mul = remaining % num == 0 && part1_test(target, remaining / num, rest);
-        let add = part1_test(target, remaining - num, rest);
+        let add = remaining >= num && part1_test(target, remaining - num, rest);
         mul || add
     }
 }
@@ -56,7 +56,7 @@ fn part2_test(target: i64, remaining: i64, numbers: &[u64]) -> bool {
         let mul = remaining % num == 0 && part2_test(target, remaining / num, rest);
         let pow = 10i64.pow(num.ilog10() + 1);
         let con = remaining % pow == num && part2_test(target, remaining / pow, rest);
-        let add = part2_test(target, remaining - num, rest);
+        let add = remaining >= num && part2_test(target, remaining - num, rest);
         mul || con || add
     }
 }