diff --git a/usr.sbin/gstat/gstat.c b/usr.sbin/gstat/gstat.c
index e7bb23bce73a..f4c7e119ab4b 100644
--- a/usr.sbin/gstat/gstat.c
+++ b/usr.sbin/gstat/gstat.c
@@ -268,7 +268,7 @@ main(int argc, char **argv)
 static void
 usage(void)
 {
-        fprintf(stderr, "usage: gstat [-cd] [-I interval]\n");
+        fprintf(stderr, "usage: gstat [-acd] [-I interval]\n");
         exit(1);
         /* NOTREACHED */
 }