diff --git a/contrib/ipfilter/ipf.h b/contrib/ipfilter/ipf.h
index f5617334a0ba..05dcfa4afd64 100644
--- a/contrib/ipfilter/ipf.h
+++ b/contrib/ipfilter/ipf.h
@@ -191,7 +191,7 @@ typedef	int	(* addfunc_t) __P((int, ioctlfunc_t, void *));
 typedef	int	(* copyfunc_t) __P((void *, void *, size_t));
 
 
-extern	char	thishost[];
+extern	char	thishost[MAXHOSTNAMELEN];
 extern	char	flagset[];
 extern	u_char	flags[];
 extern	struct ipopt_names ionames[];
diff --git a/contrib/ipfilter/tools/ipnat.c b/contrib/ipfilter/tools/ipnat.c
index 54a71653f3e2..7d76893cfd2c 100644
--- a/contrib/ipfilter/tools/ipnat.c
+++ b/contrib/ipfilter/tools/ipnat.c
@@ -60,7 +60,6 @@ static const char rcsid[] = "@(#)$Id$";
 #define	bzero(a,b)	memset(a,0,b)
 #endif
 int	use_inet6 = 0;
-char	thishost[MAXHOSTNAMELEN];
 
 extern	char	*optarg;