--- a/samples/main-simple.cc	Wed Mar 02 13:42:28 2011 -0800
+++ b/samples/main-simple.cc	Thu Mar 03 19:54:57 2011 +0000
@@ -3,6 +3,7 @@
 #include "ns3/core-module.h"
 #include "ns3/helper-module.h"
 #include "ns3/network-module.h"
+#include "ns3/internet-module.h"
 
 using namespace ns3;