diff --git a/src/sim/simulate.cc b/src/sim/simulate.cc
index 6962fab9f..fb785a91f 100644
--- a/src/sim/simulate.cc
+++ b/src/sim/simulate.cc
@@ -44,6 +44,10 @@
  * terminate the loop.  Exported to Python via SWIG.
  * @return The SimLoopExitEvent that caused the loop to exit.
  */
+
+// record the clock cycle for last exit event
+Tick lastExitTick = 0;
+
 SimLoopExitEvent *
 simulate(Tick num_cycles)
 {
@@ -67,6 +71,16 @@ simulate(Tick num_cycles)
 
         Event *exit_event = mainEventQueue.serviceOne();
         if (exit_event != NULL) {
+            /*
+             * if there are multiple exit events in the same cycle, drain the
+             * following exit events since gem5 only allows one * exit event in
+             * a cycle
+             */
+            if (lastExitTick == curTick())
+                continue;
+            else
+                lastExitTick = curTick();
+
             // hit some kind of exit event; return to Python
             // event must be subclass of SimLoopExitEvent...
             SimLoopExitEvent *se_event;