--- a/src/internet-stack/udp-socket-impl.cc	Wed Nov 05 19:45:40 2008 -0800
+++ b/src/internet-stack/udp-socket-impl.cc	Wed Nov 05 19:53:52 2008 -0800
@@ -157,7 +157,8 @@
   if (!InetSocketAddress::IsMatchingType (address))
     {
       NS_LOG_ERROR ("Not IsMatchingType");
-      return ERROR_INVAL;
+      m_errno = ERROR_INVAL;
+      return -1;
     }
   InetSocketAddress transport = InetSocketAddress::ConvertFrom (address);
   Ipv4Address ipv4 = transport.GetIpv4 ();