diff --git a/examples/simple-global-routing.cc b/examples/simple-global-routing.cc
index 4398cbb6a..24bfcf72d 100644
--- a/examples/simple-global-routing.cc
+++ b/examples/simple-global-routing.cc
@@ -178,4 +178,6 @@ int main (int argc, char *argv[])
   Simulator::Run ();
     
   Simulator::Destroy ();
+
+  return 0;
 }