diff --git a/libxfs/xfs_ialloc_btree.c b/libxfs/xfs_ialloc_btree.c
index 5042cc6..489c080 100644
--- a/libxfs/xfs_ialloc_btree.c
+++ b/libxfs/xfs_ialloc_btree.c
@@ -748,7 +748,7 @@
 	if (error)
 		return error;
 
-	cur = xfs_inobt_init_cursor(pag, tp, agbp);
+	cur = xfs_finobt_init_cursor(pag, tp, agbp);
 	error = xfs_btree_count_blocks(cur, tree_blocks);
 	xfs_btree_del_cursor(cur, error);
 	xfs_trans_brelse(tp, agbp);