diff --git a/src/devices/wifi/mac-low.cc b/src/devices/wifi/mac-low.cc
index 92b310ec8..32825901b 100644
--- a/src/devices/wifi/mac-low.cc
+++ b/src/devices/wifi/mac-low.cc
@@ -414,7 +414,7 @@ MacLow::StartTransmission (Ptr<const Packet> packet,
 }
 
 void
-MacLow::ReceiveError (Ptr<Packet> packet, double rxSnr)
+MacLow::ReceiveError (Ptr<const Packet> packet, double rxSnr)
 {
   NS_LOG_FUNCTION (this << packet << rxSnr);
   MY_DEBUG ("rx failed ");
diff --git a/src/devices/wifi/mac-low.h b/src/devices/wifi/mac-low.h
index 7dc500fd2..3933d5790 100644
--- a/src/devices/wifi/mac-low.h
+++ b/src/devices/wifi/mac-low.h
@@ -339,7 +339,7 @@ public:
    * This method is typically invoked by the lower PHY layer to notify
    * the MAC layer that a packet was unsuccessfully received.
    */
-  void ReceiveError (Ptr<Packet> packet, double rxSnr);
+  void ReceiveError (Ptr<const Packet> packet, double rxSnr);
 private:
   void CancelAllEvents (void);
   uint32_t GetAckSize (void) const;
diff --git a/src/devices/wifi/wifi-phy-state-helper.cc b/src/devices/wifi/wifi-phy-state-helper.cc
index 1b64a0749..fb53429b1 100644
--- a/src/devices/wifi/wifi-phy-state-helper.cc
+++ b/src/devices/wifi/wifi-phy-state-helper.cc
@@ -301,8 +301,7 @@ WifiPhyStateHelper::SwitchFromSyncEndError (Ptr<const Packet> packet, double snr
   DoSwitchFromSync ();
   if (!m_syncErrorCallback.IsNull ())
     {
-      // XXX
-      m_syncErrorCallback (packet->Copy (), snr);
+      m_syncErrorCallback (packet, snr);
     }
 }
 
diff --git a/src/devices/wifi/wifi-phy.h b/src/devices/wifi/wifi-phy.h
index d9bb02951..9357c978e 100644
--- a/src/devices/wifi/wifi-phy.h
+++ b/src/devices/wifi/wifi-phy.h
@@ -121,7 +121,7 @@ public:
    * arg1: packet received unsuccessfully
    * arg2: snr of packet
    */
-  typedef Callback<void,Ptr<Packet>, double> SyncErrorCallback;
+  typedef Callback<void,Ptr<const Packet>, double> SyncErrorCallback;
 
   static TypeId GetTypeId (void);