diff --git a/root-tree.c b/root-tree.c
index c10d0684..ef2190fc 100644
--- a/root-tree.c
+++ b/root-tree.c
@@ -92,6 +92,11 @@ int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *item)
 {
 	int ret;
+
+	/*
+	 * Make sure generation v1 and v2 match. See update_root for details.
+	 */
+	btrfs_set_root_generation_v2(item, btrfs_root_generation(item));
 	ret = btrfs_insert_item(trans, root, key, item, sizeof(*item));
 	return ret;
 }