diff --git a/src/edu/nps/moves/dis7/utilities/DisThreadedNetworkInterface.java b/src/edu/nps/moves/dis7/utilities/DisThreadedNetworkInterface.java
index 4867b1fc5c62703621ec52f321ba667c81a45885..eb01b41d8ad0a97dad05268edff989ff8cd1cc31 100644
--- a/src/edu/nps/moves/dis7/utilities/DisThreadedNetworkInterface.java
+++ b/src/edu/nps/moves/dis7/utilities/DisThreadedNetworkInterface.java
@@ -447,7 +447,7 @@ public class DisThreadedNetworkInterface
     {
         System.err.flush();
         System.err.println ("*** " + getClass().getName() + ".sleep(" + duration + ") failed to sleep");
-        ie.printStackTrace();
+        ie.printStackTrace(System.err);
     }
   }