diff --git a/sys/ufs/ufs/ufs_vfsops.c b/sys/ufs/ufs/ufs_vfsops.c
--- a/sys/ufs/ufs/ufs_vfsops.c
+++ b/sys/ufs/ufs/ufs_vfsops.c
@@ -129,9 +129,9 @@
 		vfs_ref(mp);
 		KASSERT(*mp_busy,
 		    ("%s called without busied mount", __func__));
+		vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
 		vfs_unbusy(mp);
 		*mp_busy = false;
-		vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
 		error = quotaoff(td, mp, type);
 		vn_finished_write(mp);
 		break;