diff --git a/sys/conf/NOTES b/sys/conf/NOTES
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -1249,6 +1249,7 @@
 options 	MAC_BIBA
 options 	MAC_BSDEXTENDED
 options 	MAC_DDB
+options		MAC_DO
 options 	MAC_IFOFF
 options 	MAC_IPACL
 options 	MAC_LOMAC
diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -5203,10 +5203,11 @@
 security/mac/mac_sysv_shm.c	optional mac
 security/mac/mac_vfs.c		optional mac
 security/mac_biba/mac_biba.c	optional mac_biba
-security/mac_ddb/mac_ddb.c	optional mac_ddb
 security/mac_bsdextended/mac_bsdextended.c	optional mac_bsdextended
 security/mac_bsdextended/ugidfw_system.c	optional mac_bsdextended
 security/mac_bsdextended/ugidfw_vnode.c		optional mac_bsdextended
+security/mac_ddb/mac_ddb.c	optional mac_ddb
+security/mac_do/mac_do.c	optional mac_do
 security/mac_ifoff/mac_ifoff.c	optional mac_ifoff
 security/mac_ipacl/mac_ipacl.c	optional mac_ipacl
 security/mac_lomac/mac_lomac.c	optional mac_lomac
diff --git a/sys/conf/options b/sys/conf/options
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -155,6 +155,7 @@
 MAC_BSDEXTENDED	opt_dontuse.h
 MAC_DDB		opt_dontuse.h
 MAC_DEBUG	opt_mac.h
+MAC_DO		opt_dontuse.h
 MAC_IFOFF	opt_dontuse.h
 MAC_IPACL	opt_dontuse.h
 MAC_LOMAC	opt_dontuse.h