--- a/src/core/model/simulator.cc	Sat Dec 15 11:32:58 2012 -0800
+++ b/src/core/model/simulator.cc	Sat Dec 15 23:02:03 2012 -0800
@@ -157,9 +157,7 @@
 Simulator::Run (void)
 {
   NS_LOG_FUNCTION_NOARGS ();
-  SimulatorImpl *impl = GetImpl ();
-  Time::FreezeResolution();
-  impl->Run ();
+  GetImpl ()->Run ();
 }
 
 void