diff --git a/usr.bin/top/machine.c b/usr.bin/top/machine.c
index 374c9da0edf4..cd17f2f5dc3a 100644
--- a/usr.bin/top/machine.c
+++ b/usr.bin/top/machine.c
@@ -1511,6 +1511,7 @@ int (*compares[])(const void *arg1, const void *arg2) = {
 	compare_ivcsw,
 	compare_jid,
 	compare_swap,
+	compare_pid,
 	NULL
 };