diff --git a/src/internet/model/ipv4-l3-protocol.cc b/src/internet/model/ipv4-l3-protocol.cc
index ea69f3491..2f9338332 100644
--- a/src/internet/model/ipv4-l3-protocol.cc
+++ b/src/internet/model/ipv4-l3-protocol.cc
@@ -891,6 +891,7 @@ Ipv4L3Protocol::LocalDeliver (Ptr<const Packet> packet, Ipv4Header const&ip, uin
         }
       NS_LOG_LOGIC ("Got last fragment, Packet is complete " << *p );
       ipHeader.SetFragmentOffset (0);
+      ipHeader.SetPayloadSize (p->GetSize () + ipHeader.GetSerializedSize ());
     }
 
   m_localDeliverTrace (ipHeader, p, iif);