diff --git a/distrib/utils/sysinst/mbr.c b/distrib/utils/sysinst/mbr.c
index 76aac4856bae..8fa3294bef24 100644
--- a/distrib/utils/sysinst/mbr.c
+++ b/distrib/utils/sysinst/mbr.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: mbr.c,v 1.10 1999/03/31 00:44:48 fvdl Exp $ */
+/*	$NetBSD: mbr.c,v 1.11 1999/04/01 11:33:02 fvdl Exp $ */
 
 /*
  * Copyright 1997 Piermont Information Systems Inc.
@@ -274,6 +274,9 @@ edit_mbr(partition)
 			}
 		} while (yesno && (numbsd != 1 || overlap));
 
+		if (activepart != -1)
+			part[activepart].mbrp_flag = 0x80;
+
 		if (numbsd == 0) {
 			msg_display(MSG_nobsdpart);
 			process_menu(MENU_ok);