diff --git a/lib/hx509/lock.c b/lib/hx509/lock.c
index 16c2a8cdc..2a271ca5a 100644
--- a/lib/hx509/lock.c
+++ b/lib/hx509/lock.c
@@ -33,7 +33,7 @@
 
 #include "hx_locl.h"
 RCSID("$Id$");
-#include <openssl/ui.h>
+#include "crypto_headers.h"
 
 struct hx509_lock_data {
     struct _hx509_password password;