diff --git a/include/bvh.hpp b/include/bvh.hpp
index 54770d4..7599f9d 100644
--- a/include/bvh.hpp
+++ b/include/bvh.hpp
@@ -1,8 +1,8 @@
 #ifndef BVH_H_
 #define BVH_H_
 
-#include<iostream>
-#include<tinynurbs/tinynurbs.h>
+#include <iostream>
+#include <tinynurbs/tinynurbs.h>
 
 //包围盒结构，存储盒子对角的两个点
 typedef struct AABB