diff --git a/fs/namespace.c b/fs/namespace.c
index 3357c3d65475..ffb13f0562b0 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2599,7 +2599,7 @@ static int do_move_mount(struct path *old_path, struct path *new_path)
 	if (attached && !check_mnt(old))
 		goto out;
 
-	if (!attached && !is_anon_ns(ns))
+	if (!attached && !(ns && is_anon_ns(ns)))
 		goto out;
 
 	if (old->mnt.mnt_flags & MNT_LOCKED)