diff --git a/dev/ns_gige.cc b/dev/ns_gige.cc
index aa47436f79..e799c10d21 100644
--- a/dev/ns_gige.cc
+++ b/dev/ns_gige.cc
@@ -2352,6 +2352,7 @@ NSGigE::serialize(ostream &os)
     bool txPacketExists = txPacket;
     SERIALIZE_SCALAR(txPacketExists);
     if (txPacketExists) {
+        txPacket->length = txPacketBufPtr - txPacket->data;
         txPacket->serialize("txPacket", os);
         uint32_t txPktBufPtr = (uint32_t) (txPacketBufPtr - txPacket->data);
         SERIALIZE_SCALAR(txPktBufPtr);