diff --git a/usr.bin/mail/mime_detach.c b/usr.bin/mail/mime_detach.c
index bd8cd203e825..f0d003756897 100644
--- a/usr.bin/mail/mime_detach.c
+++ b/usr.bin/mail/mime_detach.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: mime_detach.c,v 1.5 2009/08/28 14:26:50 christos Exp $	*/
+/*	$NetBSD: mime_detach.c,v 1.6 2011/05/24 12:33:22 joerg Exp $	*/
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
 
 #include <sys/cdefs.h>
 #ifndef __lint__
-__RCSID("$NetBSD: mime_detach.c,v 1.5 2009/08/28 14:26:50 christos Exp $");
+__RCSID("$NetBSD: mime_detach.c,v 1.6 2011/05/24 12:33:22 joerg Exp $");
 #endif /* not __lint__ */
 
 #include <assert.h>
@@ -166,7 +166,7 @@ detach_open_core(char *fname, const char *partstr)
 			return DETACH_RENAME;
 		}
 	}
-	warn(fname);
+	warn("%s", fname);
 	if (fd != -1)
 		(void)close(fd);
 
diff --git a/usr.bin/mail/support.c b/usr.bin/mail/support.c
index 0b09b4c2c75a..a57b2d166b15 100644
--- a/usr.bin/mail/support.c
+++ b/usr.bin/mail/support.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: support.c,v 1.22 2009/04/10 13:08:25 christos Exp $	*/
+/*	$NetBSD: support.c,v 1.23 2011/05/24 12:33:22 joerg Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -34,7 +34,7 @@
 #if 0
 static char sccsid[] = "@(#)aux.c	8.1 (Berkeley) 6/6/93";
 #else
-__RCSID("$NetBSD: support.c,v 1.22 2009/04/10 13:08:25 christos Exp $");
+__RCSID("$NetBSD: support.c,v 1.23 2011/05/24 12:33:22 joerg Exp $");
 #endif
 #endif /* not lint */
 
@@ -733,7 +733,7 @@ cathelp(const char *fname)
 	size_t len;
 
 	if ((f = Fopen(fname, "r")) == NULL) {
-		warn(fname);
+		warn("%s", fname);
 		return;
 	}
 	while ((line = fgetln(f, &len)) != NULL) {