diff --git a/rapidfuzz_reference/JaroWinkler.hpp b/rapidfuzz_reference/JaroWinkler.hpp
index 3b717d8..9d415e4 100644
--- a/rapidfuzz_reference/JaroWinkler.hpp
+++ b/rapidfuzz_reference/JaroWinkler.hpp
@@ -2,6 +2,7 @@
 /* Copyright © 2022-present Max Bachmann */
 
 #pragma once
+#include <cstdint>
 #include "Jaro.hpp"
 
 namespace rapidfuzz_reference {