diff --git a/common/source/java/ch/systemsx/cisd/common/exceptions/InvalidSessionException.java b/common/source/java/ch/systemsx/cisd/common/exceptions/InvalidSessionException.java
index cb8a72104de780a746cd050166733632b5ed4b3e..647545172f937a204f1785838d24159d97d33644 100644
--- a/common/source/java/ch/systemsx/cisd/common/exceptions/InvalidSessionException.java
+++ b/common/source/java/ch/systemsx/cisd/common/exceptions/InvalidSessionException.java
@@ -16,12 +16,15 @@
 
 package ch.systemsx.cisd.common.exceptions;
 
+import ch.systemsx.cisd.common.shared.basic.IOptionalStackTraceLoggingException;
+
 /**
  * This <code>UserFailureException</code> extension signals that a session has expired.
  * 
  * @author Christian Ribeaud
  */
-public final class InvalidSessionException extends UserFailureException
+public final class InvalidSessionException extends UserFailureException implements
+        IOptionalStackTraceLoggingException
 {
     private static final long serialVersionUID = 1L;