diff --git a/win/rfb_win32/SocketManager.cxx b/win/rfb_win32/SocketManager.cxx
index 1d52bc8..b33d165 100644
--- a/win/rfb_win32/SocketManager.cxx
+++ b/win/rfb_win32/SocketManager.cxx
@@ -38,7 +38,7 @@
 }
 
 
-static requestAddressChangeEvents(network::SocketListener* sock_) {
+static void requestAddressChangeEvents(network::SocketListener* sock_) {
   DWORD dummy = 0;
   if (WSAIoctl(sock_->getFd(), SIO_ADDRESS_LIST_CHANGE, 0, 0, 0, 0, &dummy, 0, 0) == SOCKET_ERROR) {
     DWORD err = WSAGetLastError();