diff --git a/src/point-to-point/model/point-to-point-channel.cc b/src/point-to-point/model/point-to-point-channel.cc
index d59cbd17b..77dd626d5 100644
--- a/src/point-to-point/model/point-to-point-channel.cc
+++ b/src/point-to-point/model/point-to-point-channel.cc
@@ -85,7 +85,7 @@ PointToPointChannel::Attach (Ptr<PointToPointNetDevice> device)
 
 bool
 PointToPointChannel::TransmitStart (
-  Ptr<Packet> p,
+  Ptr<const Packet> p,
   Ptr<PointToPointNetDevice> src,
   Time txTime)
 {
@@ -99,7 +99,7 @@ PointToPointChannel::TransmitStart (
 
   Simulator::ScheduleWithContext (m_link[wire].m_dst->GetNode ()->GetId (),
                                   txTime + m_delay, &PointToPointNetDevice::Receive,
-                                  m_link[wire].m_dst, p);
+                                  m_link[wire].m_dst, p->Copy ());
 
   // Call the tx anim callback on the net device
   m_txrxPointToPoint (p, src, m_link[wire].m_dst, txTime, txTime + m_delay);
diff --git a/src/point-to-point/model/point-to-point-channel.h b/src/point-to-point/model/point-to-point-channel.h
index e53bfe141..732bfca94 100644
--- a/src/point-to-point/model/point-to-point-channel.h
+++ b/src/point-to-point/model/point-to-point-channel.h
@@ -78,7 +78,7 @@ public:
    * \param txTime Transmit time to apply
    * \returns true if successful (currently always true)
    */
-  virtual bool TransmitStart (Ptr<Packet> p, Ptr<PointToPointNetDevice> src, Time txTime);
+  virtual bool TransmitStart (Ptr<const Packet> p, Ptr<PointToPointNetDevice> src, Time txTime);
 
   /**
    * \brief Get number of devices on this channel
diff --git a/src/point-to-point/model/point-to-point-remote-channel.cc b/src/point-to-point/model/point-to-point-remote-channel.cc
index 40f98cecb..46fe81be3 100644
--- a/src/point-to-point/model/point-to-point-remote-channel.cc
+++ b/src/point-to-point/model/point-to-point-remote-channel.cc
@@ -55,7 +55,7 @@ PointToPointRemoteChannel::~PointToPointRemoteChannel ()
 
 bool
 PointToPointRemoteChannel::TransmitStart (
-  Ptr<Packet> p,
+  Ptr<const Packet> p,
   Ptr<PointToPointNetDevice> src,
   Time txTime)
 {
@@ -70,7 +70,7 @@ PointToPointRemoteChannel::TransmitStart (
 #ifdef NS3_MPI
   // Calculate the rxTime (absolute)
   Time rxTime = Simulator::Now () + txTime + GetDelay ();
-  MpiInterface::SendPacket (p, rxTime, dst->GetNode ()->GetId (), dst->GetIfIndex ());
+  MpiInterface::SendPacket (p->Copy (), rxTime, dst->GetNode ()->GetId (), dst->GetIfIndex ());
 #else
   NS_FATAL_ERROR ("Can't use distributed simulator without MPI compiled in");
 #endif
diff --git a/src/point-to-point/model/point-to-point-remote-channel.h b/src/point-to-point/model/point-to-point-remote-channel.h
index fd1a9a8a5..f10b2df91 100644
--- a/src/point-to-point/model/point-to-point-remote-channel.h
+++ b/src/point-to-point/model/point-to-point-remote-channel.h
@@ -66,7 +66,7 @@ public:
    * \param txTime Transmit time to apply
    * \returns true if successful (currently always true)
    */
-  virtual bool TransmitStart (Ptr<Packet> p, Ptr<PointToPointNetDevice> src,
+  virtual bool TransmitStart (Ptr<const Packet> p, Ptr<PointToPointNetDevice> src,
                               Time txTime);
 };