diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4bf93184362ec34b366c4f95870b5d9aba8122bf..dcbb76b62a0b07531595d1bee97426d55437628e 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8324,6 +8324,7 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
 out_free_delayed:
 	btrfs_free_delayed_extent_op(extent_op);
 out_free_buf:
+	btrfs_tree_unlock(buf);
 	free_extent_buffer(buf);
 out_free_reserved:
 	btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 0);