diff --git a/usr.sbin/rwhod/rwhod.c b/usr.sbin/rwhod/rwhod.c
index 4dbd03958cd..96fd9ec42e5 100644
--- a/usr.sbin/rwhod/rwhod.c
+++ b/usr.sbin/rwhod/rwhod.c
@@ -410,11 +410,8 @@ onalrm(signo)
 		utmptime = stb.st_mtime;
 		if (stb.st_size > utmpsize) {
 			utmpsize = stb.st_size + 10 * sizeof(struct utmp);
-			if (utmp)
-				utmp = (struct utmp *)realloc(utmp, utmpsize);
-			else
-				utmp = (struct utmp *)malloc(utmpsize);
-			if (! utmp) {
+			utmp = (struct utmp *)reallocf(utmp, utmpsize);
+			if (utmp == NULL) {
 				syslog(LOG_WARNING, "malloc failed");
 				utmpsize = 0;
 				goto done;