diff --git a/vector/src/vector.hpp b/vector/src/vector.hpp
index fbc7ac3..ac03102 100644
--- a/vector/src/vector.hpp
+++ b/vector/src/vector.hpp
@@ -8,7 +8,7 @@
 #include <exception>
 #include <iterator>
 #include <memory>
-#include <vector>
+
 namespace sjtu {
 /**
  * a data container like std::vector