diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 171ca30..293da65 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5579,7 +5579,7 @@
 	BUG_ON(ordered->file_offset != file_pos || ordered->len != len);
 
 	disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
-	ret = btrfs_lookup_csums_range(root, disk_bytenr,
+	ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr,
 				       disk_bytenr + len - 1, &list);
 
 	while (!list_empty(&list)) {