--- a/src/stats/model/boolean-probe.cc	Thu Oct 02 21:05:15 2014 -0700
+++ b/src/stats/model/boolean-probe.cc	Thu Oct 02 21:17:48 2014 -0700
@@ -42,7 +42,8 @@
     .AddConstructor<BooleanProbe> ()
     .AddTraceSource ( "Output",
                       "The bool that serves as output for this probe",
-                      MakeTraceSourceAccessor (&BooleanProbe::m_output))
+                      MakeTraceSourceAccessor (&BooleanProbe::m_output),
+                      "ns3::TracedValue::BoolCallback")
   ;
   return tid;
 }