diff --git a/lib/hx509/hx_locl.h b/lib/hx509/hx_locl.h
index fa4f26255..b1280d85e 100644
--- a/lib/hx509/hx_locl.h
+++ b/lib/hx509/hx_locl.h
@@ -51,6 +51,7 @@
 #include <roken.h>
 #include <com_err.h>
 #include <parse_units.h>
+#include <parse_bytes.h>
 
 #include <krb5-types.h>