diff --git a/kexdhc.c b/kexdhc.c
index d384c80..76ceb5d 100644
--- a/kexdhc.c
+++ b/kexdhc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexdhc.c,v 1.11 2006/11/06 21:25:28 markus Exp $ */
+/* $OpenBSD: kexdhc.c,v 1.12 2010/11/10 01:33:07 djm Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -27,6 +27,8 @@
 
 #include <sys/types.h>
 
+#include <openssl/dh.h>
+
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>