diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 7bd12c2..2956fe2 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -181,7 +181,7 @@
 	return 0;
 }
 
-int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
+int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
 		      struct __btrfs_path *p)
 {
 	u8 lvl, prev_lvl;