diff --git a/usr.sbin/pstat/pstat.c b/usr.sbin/pstat/pstat.c
index e7427cec51d8..773bfa186a90 100644
--- a/usr.sbin/pstat/pstat.c
+++ b/usr.sbin/pstat/pstat.c
@@ -217,7 +217,7 @@ main(argc, argv)
 		opts = argv[0];
 	if (!strcmp(opts,"swapinfo")) {
 		swapflag = 1;
-		opts = "k";
+		opts = "kM:N:";
 		usage = "usage: swapinfo [-k] [-M core] [-N system]\n";
 	} else {
 		opts = "TM:N:fiknstv";