--- a/src/internet-node/tcp-header.cc	Mon Mar 17 12:12:17 2008 -0700
+++ b/src/internet-node/tcp-header.cc	Mon Mar 17 13:12:17 2008 -0700
@@ -27,9 +27,24 @@
 namespace ns3 {
 
 NS_HEADER_ENSURE_REGISTERED (TcpHeader);
+NS_OBJECT_ENSURE_REGISTERED (TcpHeader);
 
 bool TcpHeader::m_calcChecksum = false;
 
+TypeId 
+TcpHeader::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ns3::TcpHeader")
+    .SetParent<Header> ()
+    ;
+  return tid;
+}
+TypeId 
+TcpHeader::GetInstanceTypeId (void) const
+{
+  return GetTypeId ();
+}
+
 uint32_t
 TcpHeader::GetUid (void)
 {