diff --git a/src/include/robin_hood.h b/src/include/robin_hood.h
index b4e0fbc..b83eaef 100644
--- a/src/include/robin_hood.h
+++ b/src/include/robin_hood.h
@@ -39,6 +39,7 @@
 #define ROBIN_HOOD_VERSION_PATCH 5  // for backwards-compatible bug fixes
 
 #include <algorithm>
+#include <cstdint>
 #include <cstdlib>
 #include <cstring>
 #include <functional>