diff --git a/usr.bin/tail/Makefile b/usr.bin/tail/Makefile
index de1c3c99301e..c8166936983d 100644
--- a/usr.bin/tail/Makefile
+++ b/usr.bin/tail/Makefile
@@ -1,6 +1,8 @@
+# $FreeBSD$
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
 
 PROG=	tail
 SRCS=	forward.c misc.c read.c reverse.c tail.c
+WARNS?=	4
 
 .include <bsd.prog.mk>
diff --git a/usr.bin/tail/tail.c b/usr.bin/tail/tail.c
index 70afd4da0a78..2a3ee1365e74 100644
--- a/usr.bin/tail/tail.c
+++ b/usr.bin/tail/tail.c
@@ -67,9 +67,7 @@ static void obsolete(char **);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat sb;
 	FILE *fp;
@@ -222,8 +220,7 @@ main(argc, argv)
  * the option argument for a -b, -c or -n option gets converted.
  */
 static void
-obsolete(argv)
-	char *argv[];
+obsolete(char *argv[])
 {
 	char *ap, *p, *t;
 	size_t len;
@@ -306,7 +303,7 @@ obsolete(argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 	    "usage: tail [-F | -f | -r] [-b # | -c # | -n #] [file ...]\n");