diff --git a/hikyuu_cpp/hikyuu/KDataImp.h b/hikyuu_cpp/hikyuu/KDataImp.h
index 40e1dd03b..f6681c6bb 100644
--- a/hikyuu_cpp/hikyuu/KDataImp.h
+++ b/hikyuu_cpp/hikyuu/KDataImp.h
@@ -13,7 +13,7 @@
 
 namespace hku {
 
-class KDataImp {
+class HKU_API KDataImp {
 public:
     KDataImp();
     KDataImp(const Stock& stock, const KQuery& query);