diff --git a/src/core/model/default-simulator-impl.cc b/src/core/model/default-simulator-impl.cc
index 8b182b951..039b01471 100644
--- a/src/core/model/default-simulator-impl.cc
+++ b/src/core/model/default-simulator-impl.cc
@@ -283,15 +283,7 @@ DefaultSimulatorImpl::ScheduleNow (EventImpl *event)
 {
   NS_ASSERT_MSG (SystemThread::Equals (m_main), "Simulator::ScheduleNow Thread-unsafe invocation!");
 
-  Scheduler::Event ev;
-  ev.impl = event;
-  ev.key.m_ts = m_currentTs;
-  ev.key.m_context = GetContext ();
-  ev.key.m_uid = m_uid;
-  m_uid++;
-  m_unscheduledEvents++;
-  m_events->Insert (ev);
-  return EventId (event, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
+  return Schedule (Time (0), event);
 }
 
 EventId
diff --git a/src/core/model/realtime-simulator-impl.cc b/src/core/model/realtime-simulator-impl.cc
index 7d098ebd5..dd7d17289 100644
--- a/src/core/model/realtime-simulator-impl.cc
+++ b/src/core/model/realtime-simulator-impl.cc
@@ -579,21 +579,7 @@ EventId
 RealtimeSimulatorImpl::ScheduleNow (EventImpl *impl)
 {
   NS_LOG_FUNCTION (this << impl);
-  Scheduler::Event ev;
-  {
-    CriticalSection cs (m_mutex);
-
-    ev.impl = impl;
-    ev.key.m_ts = m_currentTs;
-    ev.key.m_context = GetContext ();
-    ev.key.m_uid = m_uid;
-    m_uid++;
-    m_unscheduledEvents++;
-    m_events->Insert (ev);
-    m_synchronizer->Signal ();
-  }
-
-  return EventId (impl, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
+  return Schedule (Time (0), impl);
 }
 
 Time
diff --git a/src/mpi/model/distributed-simulator-impl.cc b/src/mpi/model/distributed-simulator-impl.cc
index 1a3822f5e..ee4fef83f 100644
--- a/src/mpi/model/distributed-simulator-impl.cc
+++ b/src/mpi/model/distributed-simulator-impl.cc
@@ -508,16 +508,7 @@ EventId
 DistributedSimulatorImpl::ScheduleNow (EventImpl *event)
 {
   NS_LOG_FUNCTION (this << event);
-
-  Scheduler::Event ev;
-  ev.impl = event;
-  ev.key.m_ts = m_currentTs;
-  ev.key.m_context = GetContext ();
-  ev.key.m_uid = m_uid;
-  m_uid++;
-  m_unscheduledEvents++;
-  m_events->Insert (ev);
-  return EventId (event, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
+  return Schedule (Time (0), event);
 }
 
 EventId
diff --git a/src/mpi/model/null-message-simulator-impl.cc b/src/mpi/model/null-message-simulator-impl.cc
index 068a12812..bfb35c208 100644
--- a/src/mpi/model/null-message-simulator-impl.cc
+++ b/src/mpi/model/null-message-simulator-impl.cc
@@ -438,16 +438,7 @@ EventId
 NullMessageSimulatorImpl::ScheduleNow (EventImpl *event)
 {
   NS_LOG_FUNCTION (this << event);
-
-  Scheduler::Event ev;
-  ev.impl = event;
-  ev.key.m_ts = m_currentTs;
-  ev.key.m_context = GetContext ();
-  ev.key.m_uid = m_uid;
-  m_uid++;
-  m_unscheduledEvents++;
-  m_events->Insert (ev);
-  return EventId (event, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
+  return Schedule (Time (0), event);
 }
 
 EventId