diff --git a/common/network/TcpSocket.cxx b/common/network/TcpSocket.cxx
index 4b9da3b..a45e535 100644
--- a/common/network/TcpSocket.cxx
+++ b/common/network/TcpSocket.cxx
@@ -25,6 +25,9 @@
 #include <winsock2.h>
 #define errorNumber WSAGetLastError()
 #define snprintf _snprintf
+#ifndef VNC_SOCKLEN_T
+#define VNC_SOCKLEN_T int
+#endif
 #else
 #define errorNumber errno
 #define closesocket close