diff --git a/libretroshare/src/pqi/pqihash.h b/libretroshare/src/pqi/pqihash.h
index bf87f9d2f..7bf3cd506 100644
--- a/libretroshare/src/pqi/pqihash.h
+++ b/libretroshare/src/pqi/pqihash.h
@@ -27,6 +27,7 @@
 #include <string>
 #include <iomanip>
 #include "util/rsstring.h"
+#include <inttypes.h>
 
 class pqihash
 {