diff --git a/sbin/mount/mntopts.h b/sbin/mount/mntopts.h
index 73c3c15a838f..a30a707306e8 100644
--- a/sbin/mount/mntopts.h
+++ b/sbin/mount/mntopts.h
@@ -56,6 +56,7 @@ struct mntopt {
 #define MOPT_NOCLUSTERR		{ "clusterr",	1, MNT_NOCLUSTERR, 0 }
 #define MOPT_NOCLUSTERW		{ "clusterw",	1, MNT_NOCLUSTERW, 0 }
 #define MOPT_SUIDDIR		{ "suiddir",	0, MNT_SUIDDIR, 0 }
+#define MOPT_SNAPSHOT		{ "snapshot",	0, MNT_SNAPSHOT, 0 }
 
 /* Control flags. */
 #define MOPT_FORCE		{ "force",	0, MNT_FORCE, 0 }
diff --git a/sbin/mount/mount_ufs.c b/sbin/mount/mount_ufs.c
index 3c0b6fcb711f..d4c8181dd088 100644
--- a/sbin/mount/mount_ufs.c
+++ b/sbin/mount/mount_ufs.c
@@ -66,6 +66,7 @@ static struct mntopt mopts[] = {
 	MOPT_FORCE,
 	MOPT_SYNC,
 	MOPT_UPDATE,
+	MOPT_SNAPSHOT,
 	{ NULL }
 };
 
diff --git a/sbin/mount_ifs/mntopts.h b/sbin/mount_ifs/mntopts.h
index 73c3c15a838f..a30a707306e8 100644
--- a/sbin/mount_ifs/mntopts.h
+++ b/sbin/mount_ifs/mntopts.h
@@ -56,6 +56,7 @@ struct mntopt {
 #define MOPT_NOCLUSTERR		{ "clusterr",	1, MNT_NOCLUSTERR, 0 }
 #define MOPT_NOCLUSTERW		{ "clusterw",	1, MNT_NOCLUSTERW, 0 }
 #define MOPT_SUIDDIR		{ "suiddir",	0, MNT_SUIDDIR, 0 }
+#define MOPT_SNAPSHOT		{ "snapshot",	0, MNT_SNAPSHOT, 0 }
 
 /* Control flags. */
 #define MOPT_FORCE		{ "force",	0, MNT_FORCE, 0 }
diff --git a/sbin/mount_ifs/mount_ufs.c b/sbin/mount_ifs/mount_ufs.c
index 3c0b6fcb711f..d4c8181dd088 100644
--- a/sbin/mount_ifs/mount_ufs.c
+++ b/sbin/mount_ifs/mount_ufs.c
@@ -66,6 +66,7 @@ static struct mntopt mopts[] = {
 	MOPT_FORCE,
 	MOPT_SYNC,
 	MOPT_UPDATE,
+	MOPT_SNAPSHOT,
 	{ NULL }
 };