diff --git a/ws/ixcrypto/IXHash.h b/ws/ixcrypto/IXHash.h
index d015354f..5d19571a 100644
--- a/ws/ixcrypto/IXHash.h
+++ b/ws/ixcrypto/IXHash.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <vector>
 
 namespace ix