diff --git a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
index 3e8ae91..02d45b9 100644
--- a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
+++ b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
@@ -89,7 +89,7 @@ boolean commit(Session session, String alternativeSiteName) throws IOException {
 		long start = System.currentTimeMillis();
 		SessionData currentSessionData = null;
 		if (hzSession.isDirty() || getPersistentSessions().get(session.getId())
-				.checksum() != (currentSessionData = hzSession.serialize()).checksum()) {
+				.checksum() != (currentSessionData = hzSession.serialize(alternativeSiteName)).checksum()) {
 			SessionData sessionData = null == currentSessionData ? hzSession.serialize() : currentSessionData;
 			getPersistentSessions().set(session.getId(), sessionData);
 			if (log.isDebugEnabled()) {