diff --git a/usr.bin/w/pr_time.c b/usr.bin/w/pr_time.c
index 817bbd86bd66..5ac060de4bcc 100644
--- a/usr.bin/w/pr_time.c
+++ b/usr.bin/w/pr_time.c
@@ -52,8 +52,7 @@ static const char sccsid[] = "@(#)pr_time.c	8.2 (Berkeley) 4/4/94";
  *	Print the time since the user logged in.
  */
 void
-pr_attime(started, now)
-	time_t *started, *now;
+pr_attime(time_t *started, time_t *now)
 {
 	static char buf[256];
 	struct tm tp, tm;
@@ -92,8 +91,7 @@ pr_attime(started, now)
  *	Returns number of excess characters that were used for long idle time.
  */
 int
-pr_idle(idle)
-	time_t idle;
+pr_idle(time_t idle)
 {
 	/* If idle more than 36 hours, print as a number of days. */
 	if (idle >= 36 * 3600) {
diff --git a/usr.bin/w/proc_compare.c b/usr.bin/w/proc_compare.c
index 79f7f83f1974..62ff0d2f9ffa 100644
--- a/usr.bin/w/proc_compare.c
+++ b/usr.bin/w/proc_compare.c
@@ -75,8 +75,7 @@ __FBSDID("$FreeBSD$");
 #define BOTH    3
 
 int
-proc_compare(p1, p2)
-	struct kinfo_proc *p1, *p2;
+proc_compare(struct kinfo_proc *p1, struct kinfo_proc *p2)
 {
 
 	if (p1 == NULL)
diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
index 9a16140096d5..e93630f2e73d 100644
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -129,9 +129,7 @@ static int		 this_is_uptime(const char *s);
 char *fmt_argv(char **, char *, int);	/* ../../bin/ps/fmt.c */
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char *argv[])
 {
 	struct kinfo_proc *kp;
 	struct kinfo_proc *dkp;
@@ -419,9 +417,7 @@ main(argc, argv)
 }
 
 static void
-pr_header(nowp, nusers)
-	time_t *nowp;
-	int nusers;
+pr_header(time_t *nowp, int nusers)
 {
 	double avenrun[3];
 	time_t uptime;
@@ -489,9 +485,7 @@ pr_header(nowp, nusers)
 }
 
 static struct stat *
-ttystat(line, sz)
-	char *line;
-	int sz;
+ttystat(char *line, int sz)
 {
 	static struct stat sb;
 	char ttybuf[MAXPATHLEN];
@@ -505,8 +499,7 @@ ttystat(line, sz)
 }
 
 static void
-usage(wcmd)
-	int wcmd;
+usage(int wcmd)
 {
 	if (wcmd)
 		(void)fprintf(stderr,
@@ -517,8 +510,7 @@ usage(wcmd)
 }
 
 static int 
-this_is_uptime(s)
-	const char *s;
+this_is_uptime(const char *s)
 {
 	const char *u;