--- a/src/csma/examples/csma-one-subnet.cc	Mon Aug 13 10:46:09 2012 -0700
+++ b/src/csma/examples/csma-one-subnet.cc	Mon Aug 13 16:08:13 2012 -0700
@@ -89,8 +89,8 @@
 
   OnOffHelper onoff ("ns3::UdpSocketFactory", 
                      Address (InetSocketAddress (interfaces.GetAddress (1), port)));
-  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
-  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
+  onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
+  onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
 
   ApplicationContainer app = onoff.Install (nodes.Get (0));
   // Start the application