diff --git a/src/uan/model/uan-mac-cw.cc b/src/uan/model/uan-mac-cw.cc
index 8c12f7dc1..257f226f5 100644
--- a/src/uan/model/uan-mac-cw.cc
+++ b/src/uan/model/uan-mac-cw.cc
@@ -139,6 +139,7 @@ UanMacCw::Enqueue (Ptr<Packet> packet, uint16_t protocolNumber, const Address &d
         header.SetDest (Mac8Address::ConvertFrom (dest));
         header.SetSrc (m_address);
         header.SetType (0);
+        header.SetProtocolNumber (0);
         packet->AddHeader (header);
 
         m_enqueueLogger (packet, GetTxModeIndex ());