diff --git a/sbin/mount_unionfs/mount_unionfs.8 b/sbin/mount_unionfs/mount_unionfs.8
index 36af48bffffe..b3f38207df45 100644
--- a/sbin/mount_unionfs/mount_unionfs.8
+++ b/sbin/mount_unionfs/mount_unionfs.8
@@ -39,7 +39,7 @@
 .Nd mount union file systems
 .Sh SYNOPSIS
 .Nm
-.Op Fl br
+.Op Fl b
 .Op Fl o Ar options
 .Ar directory
 .Ar uniondir