--- a/src/devices/wifi/interference-helper.cc	Sat Jun 14 10:52:10 2008 -0700
+++ b/src/devices/wifi/interference-helper.cc	Tue Oct 28 11:26:58 2008 +0100
@@ -3,6 +3,7 @@
 #include "error-rate-model.h"
 #include "ns3/simulator.h"
 #include "ns3/log.h"
+#include <algorithm>
 
 NS_LOG_COMPONENT_DEFINE ("InterferenceHelper");
 
@@ -107,6 +108,10 @@
 {
   m_errorRateModel = Create<ErrorRateModel> ();
 }
+InterferenceHelper::~InterferenceHelper ()
+{
+  m_errorRateModel = 0;
+}
 
 Ptr<InterferenceHelper::Event> 
 InterferenceHelper::Add (uint32_t size, WifiMode payloadMode,