diff --git a/include/fc/network/tcp_socket.hpp b/include/fc/network/tcp_socket.hpp
index 2fd235e..f9dbce0 100644
--- a/include/fc/network/tcp_socket.hpp
+++ b/include/fc/network/tcp_socket.hpp
@@ -49,7 +49,7 @@ namespace fc {
       friend class tcp_server;
       class impl;
       #ifdef _WIN64
-      fc::fwd<impl,0x70> my;
+      fc::fwd<impl,0x78> my;
       #else
       fc::fwd<impl,0x4c> my;
       #endif