diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index 07ae69b1b79..0dc5753e017 100644
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -2251,6 +2251,7 @@ ffs_use_bwrite(void *devfd, off_t loc, void *buf, int size)
 	bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
 	UFS_UNLOCK(ump);
 	fs = (struct fs *)bp->b_data;
+	fs->fs_fmod = 0;
 	ffs_oldfscompat_write(fs, ump);
 	fs->fs_si = NULL;
 	/* Recalculate the superblock hash */