diff --git a/src/simulator/simulator.cc b/src/simulator/simulator.cc
index 2abaf218a..0dd3c003c 100644
--- a/src/simulator/simulator.cc
+++ b/src/simulator/simulator.cc
@@ -276,6 +276,13 @@ Simulator::GetMaximumSimulationTime (void)
   return GetImpl ()->GetMaximumSimulationTime ();
 }
 
+void
+Simulator::SetImplementation (Ptr<SimulatorImpl> impl)
+{
+  NS_FATAL_ERROR ("TODO");
+}
+
+
 } // namespace ns3