diff --git a/include/sta/Hash.hh b/include/sta/Hash.hh
index b54112b6..4882b993 100644
--- a/include/sta/Hash.hh
+++ b/include/sta/Hash.hh
@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <cstddef>
 
 namespace sta {