diff --git a/unix/vncviewer/vncviewer.cxx b/unix/vncviewer/vncviewer.cxx
index 5a4ee37..9cbe295 100644
--- a/unix/vncviewer/vncviewer.cxx
+++ b/unix/vncviewer/vncviewer.cxx
@@ -370,7 +370,7 @@
       if (vncServerName && isdigit(vncServerName[0]))
         port = atoi(vncServerName);
 
-      TcpListener listener(port);
+      TcpListener listener(NULL, port);
 
       vlog.info("Listening on port %d\n",port);