diff --git a/rtl/win/winsock.pp b/rtl/win/winsock.pp
index e5b680b637..fbb4835d3b 100644
--- a/rtl/win/winsock.pp
+++ b/rtl/win/winsock.pp
@@ -25,6 +25,7 @@ unit winsock;
        windows;
 
     const
+       WINSOCK_VERSION = $0101;
        {
          Default maximium number of sockets.
          this does not