diff --git a/core/src/main/java/org/acegisecurity/concurrent/SessionInformation.java b/core/src/main/java/org/acegisecurity/concurrent/SessionInformation.java
index f171f534aa..8ed25ea92b 100644
--- a/core/src/main/java/org/acegisecurity/concurrent/SessionInformation.java
+++ b/core/src/main/java/org/acegisecurity/concurrent/SessionInformation.java
@@ -18,6 +18,7 @@ package org.acegisecurity.concurrent;
 import org.springframework.util.Assert;
 
 import java.util.Date;
+import java.io.Serializable;
 
 
 /**
@@ -32,7 +33,7 @@ import java.util.Date;
  * @author Ben Alex
  * @version $Id$
  */
-public class SessionInformation {
+public class SessionInformation implements Serializable {
     //~ Instance fields ================================================================================================
 
     private Date lastRequest;
@@ -51,8 +52,6 @@ public class SessionInformation {
         this.lastRequest = lastRequest;
     }
 
-    private SessionInformation() {}
-
     //~ Methods ========================================================================================================
 
     public void expireNow() {