diff --git a/hikyuu_cpp/hikyuu/utilities/os.h b/hikyuu_cpp/hikyuu/utilities/os.h
index cd247f927..a322f38d7 100644
--- a/hikyuu_cpp/hikyuu/utilities/os.h
+++ b/hikyuu_cpp/hikyuu/utilities/os.h
@@ -15,6 +15,7 @@
 #include <string>
 #include "Null.h"
 #include "arithmetic.h"
+#include <cstdint>
 
 #ifndef HKU_API
 #define HKU_API