--- a/xio-openssl.c
+++ b/xio-openssl.c
@@ -8,6 +8,8 @@
#if WITH_OPENSSL /* make this address configure dependend */
#include <openssl/conf.h>
#include <openssl/x509v3.h>
+#include <openssl/dh.h>
+#include <openssl/bn.h>
#include "xioopen.h"