diff --git a/usr.bin/apply/Makefile b/usr.bin/apply/Makefile
index ca0f10a2fce8..0355588b3c39 100644
--- a/usr.bin/apply/Makefile
+++ b/usr.bin/apply/Makefile
@@ -2,5 +2,6 @@
 # $FreeBSD$
 
 PROG=	apply
+WARNS?=	4
 
 .include <bsd.prog.mk>
diff --git a/usr.bin/apply/apply.c b/usr.bin/apply/apply.c
index e2f808aeb2d1..25ba374d97e9 100644
--- a/usr.bin/apply/apply.c
+++ b/usr.bin/apply/apply.c
@@ -258,7 +258,7 @@ exec_shell(const char *command, char *use_shell, char *use_name)
 }
 
 void
-usage()
+usage(void)
 {
 
 	(void)fprintf(stderr,
diff --git a/usr.bin/ar/Makefile b/usr.bin/ar/Makefile
index 1d6d8bd42a03..3046cde6da29 100644
--- a/usr.bin/ar/Makefile
+++ b/usr.bin/ar/Makefile
@@ -7,5 +7,6 @@ SRCS=	append.c ar.c archive.c contents.c delete.c extract.c misc.c \
 CFLAGS+=-I${.CURDIR}
 MAN=	ar.1aout ar.5
 BINDIR=	/usr/libexec/aout
+WARNS?=	4
 
 .include <bsd.prog.mk>
diff --git a/usr.bin/ar/ar.c b/usr.bin/ar/ar.c
index 19dddde5d7ad..c39d1b7c0b13 100644
--- a/usr.bin/ar/ar.c
+++ b/usr.bin/ar/ar.c
@@ -79,9 +79,7 @@ static void usage(void);
  *	option parsing and sanity checking.
  */
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int c;
 	char *p;
diff --git a/usr.bin/mklocale/Makefile b/usr.bin/mklocale/Makefile
index 9e23243d9147..eb63413e932b 100644
--- a/usr.bin/mklocale/Makefile
+++ b/usr.bin/mklocale/Makefile
@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PROG=	mklocale
-WARNS?=	2
+WARNS?=	4
 SRCS=	yacc.y lex.l y.tab.h
 CFLAGS+= -I. -I${.CURDIR}
 
diff --git a/usr.bin/mklocale/yacc.y b/usr.bin/mklocale/yacc.y
index f1c1c795600f..a9a4693ae674 100644
--- a/usr.bin/mklocale/yacc.y
+++ b/usr.bin/mklocale/yacc.y
@@ -201,9 +201,7 @@ int debug = 0;
 FILE *fp;
 
 int
-main(ac, av)
-	int ac;
-	char *av[];
+main(int ac, char *av[])
 {
     int x;
 
diff --git a/usr.bin/nohup/Makefile b/usr.bin/nohup/Makefile
index 5ec4057d30a5..cd635cefa526 100644
--- a/usr.bin/nohup/Makefile
+++ b/usr.bin/nohup/Makefile
@@ -2,5 +2,6 @@
 # $FreeBSD$
 
 PROG=	nohup
+WARNS?=	4
 
 .include <bsd.prog.mk>
diff --git a/usr.bin/nohup/nohup.c b/usr.bin/nohup/nohup.c
index 230365f59795..fbb9754303e0 100644
--- a/usr.bin/nohup/nohup.c
+++ b/usr.bin/nohup/nohup.c
@@ -71,9 +71,7 @@ static void usage(void);
 #define	EXIT_MISC	127
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int exit_status;
 
@@ -98,7 +96,7 @@ main(argc, argv)
 }
 
 static void
-dofile()
+dofile(void)
 {
 	int fd;
 	char path[MAXPATHLEN];
@@ -132,7 +130,7 @@ dofile()
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n");
 	exit(EXIT_MISC);