diff --git a/ssh-keyscan.c b/ssh-keyscan.c
index 38c37e5..fd71f72 100644
--- a/ssh-keyscan.c
+++ b/ssh-keyscan.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh-keyscan.c,v 1.67 2006/07/12 22:28:52 stevesk Exp $ */
+/* $OpenBSD: ssh-keyscan.c,v 1.68 2006/07/17 01:31:10 stevesk Exp $ */
 /*
  * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
  *
@@ -17,6 +17,7 @@
 #include <errno.h>
 #include <stdarg.h>
 #include <setjmp.h>
+#include <unistd.h>
 
 #include <openssl/bn.h>