diff -r b0222fd00d67 src/internet/test/tcp-error-model.cc
--- a/src/internet/test/tcp-error-model.cc	Tue Oct 03 16:41:40 2017 -0700
+++ b/src/internet/test/tcp-error-model.cc	Thu Oct 05 08:01:33 2017 -0700
@@ -53,19 +53,19 @@
   Ipv4Header ipHeader;
   TcpHeader tcpHeader;
 
-  p->RemoveHeader (ipHeader);
-  p->RemoveHeader (tcpHeader);
+  Ptr<Packet> pkt = p->Copy ();
 
-  bool toDrop = ShouldDrop (ipHeader, tcpHeader, p->GetSize ());
+  pkt->RemoveHeader (ipHeader);
+  pkt->RemoveHeader (tcpHeader);
+
+  bool toDrop = ShouldDrop (ipHeader, tcpHeader, pkt->GetSize ());
 
   if (toDrop && ! m_dropCallback.IsNull ())
     {
-      m_dropCallback (ipHeader, tcpHeader, p);
+      NS_LOG_DEBUG ("Dropping");
+      m_dropCallback (ipHeader, tcpHeader, pkt);
     }
 
-  p->AddHeader (tcpHeader);
-  p->AddHeader (ipHeader);
-
   return toDrop;
 }