diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
index d88b5fd81a8a..72b85826eb60 100644
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -516,7 +516,7 @@ pr_header(time_t *nowp, int nusers)
 	/*
 	 * Print 1, 5, and 15 minute load averages.
 	 */
-	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
+	if (getloadavg(avenrun, nitems(avenrun)) == -1)
 		xo_emit(", no load average information available\n");
 	else {
 	        static const char *format[] = {
@@ -525,7 +525,7 @@ pr_header(time_t *nowp, int nusers)
 		    " {:load-average-15/%.2f}",
 		};
 		xo_emit(", load averages:");
-		for (i = 0; i < (int)(sizeof(avenrun) / sizeof(avenrun[0])); i++) {
+		for (i = 0; i < (int)(nitems(avenrun)); i++) {
 			if (use_comma && i > 0)
 				xo_emit(",");
 			xo_emit(format[i], avenrun[i]);