diff --git a/src/Info.hpp b/src/Info.hpp
index b7d040f..4bc1222 100644
--- a/src/Info.hpp
+++ b/src/Info.hpp
@@ -27,6 +27,7 @@
 #pragma once
 
 #include <climits>
+#include <cstddef>
 #include <cstdint>
 #include <set>
 #include <tuple>