diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 5d8dcaaf11fe..7dea5615bd8f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -802,7 +802,6 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 	struct extent_buffer *leaf;
 	struct btrfs_root *tree_root = fs_info->tree_root;
 	struct btrfs_root *root;
-	struct btrfs_key key;
 	unsigned int nofs_flag;
 	int ret = 0;
 
@@ -851,10 +850,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 
 	btrfs_tree_unlock(leaf);
 
-	key.objectid = objectid;
-	key.type = BTRFS_ROOT_ITEM_KEY;
-	key.offset = 0;
-	ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
+	ret = btrfs_insert_root(trans, tree_root, &root->root_key, &root->root_item);
 	if (ret)
 		goto fail;