--- a/src/devices/wifi/nqsta-wifi-mac.h	Sat Mar 15 19:51:40 2008 +0100
+++ b/src/devices/wifi/nqsta-wifi-mac.h	Sat Mar 15 22:27:35 2008 +0100
@@ -141,7 +141,7 @@
   Ptr<WifiRemoteStationManager> m_stationManager;
   DcfManager *m_dcfManager;
   MacRxMiddle *m_rxMiddle;
-  MacLow *m_low;
+  Ptr<MacLow> m_low;
   Mac48Address m_address;
   Ssid m_ssid;
 };