diff --git a/include/Socket/IOCP.hpp b/include/Socket/IOCP.hpp
index 502581d..2b3267a 100644
--- a/include/Socket/IOCP.hpp
+++ b/include/Socket/IOCP.hpp
@@ -48,6 +48,7 @@ struct IOCPPASSINDATA {
 #endif
 
     IOCPPASSINDATA() {
+        std::memset(&overlapped, 0, sizeof(overlapped));
         event = IOCPEVENT::QUIT;
         socket = nullptr;
         recvbytes = 0;