diff --git a/sys/fs/ntfs/ntfs_vfsops.c b/sys/fs/ntfs/ntfs_vfsops.c
index d664f2c9b37e..81822fa0587b 100644
--- a/sys/fs/ntfs/ntfs_vfsops.c
+++ b/sys/fs/ntfs/ntfs_vfsops.c
@@ -776,5 +776,5 @@ static struct vfsops ntfs_vfsops = {
 	.vfs_unmount =	ntfs_unmount,
 	.vfs_vget =	ntfs_vget,
 };
-VFS_SET(ntfs_vfsops, ntfs, 0);
+VFS_SET(ntfs_vfsops, ntfs, VFCF_READONLY);
 MODULE_VERSION(ntfs, 1);
diff --git a/sys/gnu/fs/xfs/FreeBSD/xfs_mountops.c b/sys/gnu/fs/xfs/FreeBSD/xfs_mountops.c
index 413a524971fc..8597c6c28a1f 100644
--- a/sys/gnu/fs/xfs/FreeBSD/xfs_mountops.c
+++ b/sys/gnu/fs/xfs/FreeBSD/xfs_mountops.c
@@ -422,7 +422,7 @@ static struct vfsops xfs_fsops = {
 	.vfs_extattrctl = _xfs_extattrctl,
 };
 
-VFS_SET(xfs_fsops, xfs, 0);
+VFS_SET(xfs_fsops, xfs, VFCF_READONLY);
 
 /*
  *  Copy GEOM VFS functions here to provide a conveniet place to