--- a/src/internet/model/tcp-rfc793.cc	Fri Mar 27 22:24:25 2015 +0100
+++ b/src/internet/model/tcp-rfc793.cc	Sun Mar 29 11:14:34 2015 +0200
@@ -32,6 +32,7 @@
 {
   static TypeId tid = TypeId ("ns3::TcpRfc793")
     .SetParent<TcpSocketBase> ()
+    .SetGroupName ("Internet")
     .AddConstructor<TcpRfc793> ()
   ;
   return tid;