diff --git a/advent_of_code_2022/day5/main2.cc b/advent_of_code_2022/day5/main2.cc
index 2dc2512..4fe9de8 100644
--- a/advent_of_code_2022/day5/main2.cc
+++ b/advent_of_code_2022/day5/main2.cc
@@ -36,7 +36,7 @@ std::vector<std::vector<char>> read_initial_setup()
 
 struct Instruction
 {
-    std::size_t move{};
+    std::ptrdiff_t move{};
     std::size_t from{};
     std::size_t to{};
 };