diff --git a/source/java/org/alfresco/repo/invitation/InviteHelper.java b/source/java/org/alfresco/repo/invitation/InviteHelper.java
index 18a6c4c34b..dfeb7b174b 100644
--- a/source/java/org/alfresco/repo/invitation/InviteHelper.java
+++ b/source/java/org/alfresco/repo/invitation/InviteHelper.java
@@ -325,7 +325,7 @@ public class InviteHelper implements InitializingBean
         deleteAuthenticationIfUnused(inviteeUserName, currentInviteId);
     }
     
-    public  void sendNominatedInvitation(Map<String, Object> executionVariables)
+    public  void sendNominatedInvitation(String inviteId, Map<String, Object> executionVariables)
     {
         if(invitationService.isSendEmails())
         {
@@ -336,9 +336,7 @@ public class InviteHelper implements InitializingBean
             String packageRef = packageNode.getNodeRef().toString();
             properties.put(InviteSender.WF_PACKAGE, packageRef);
             
-            String instanceName=WorkflowModel.PROP_WORKFLOW_INSTANCE_ID.toPrefixString(namespaceService).replace(":", "_");
-            String instanceId = (String) executionVariables.get(instanceName);
-            properties.put(InviteSender.WF_INSTANCE_ID, instanceId);
+            properties.put(InviteSender.WF_INSTANCE_ID, inviteId);
             
             inviteSender.sendMail(properties);
         }
diff --git a/source/java/org/alfresco/repo/invitation/activiti/SendNominatedInviteDelegate.java b/source/java/org/alfresco/repo/invitation/activiti/SendNominatedInviteDelegate.java
index 17c5d44718..e361fa5a8b 100644
--- a/source/java/org/alfresco/repo/invitation/activiti/SendNominatedInviteDelegate.java
+++ b/source/java/org/alfresco/repo/invitation/activiti/SendNominatedInviteDelegate.java
@@ -21,6 +21,7 @@ package org.alfresco.repo.invitation.activiti;
 import java.util.Map;
 
 import org.activiti.engine.delegate.DelegateExecution;
+import org.alfresco.repo.workflow.activiti.ActivitiConstants;
 
 /**
  * Activiti delegate that is executed when a invitation request has
@@ -36,8 +37,9 @@ public class SendNominatedInviteDelegate extends AbstractInvitationDelegate
     @Override
     public void execute(DelegateExecution execution) throws Exception
     {
+        String invitationId = ActivitiConstants.ENGINE_ID + "$" + execution.getProcessInstanceId();
         Map<String, Object> variables = execution.getVariables();
-        inviteHelper.sendNominatedInvitation(variables);
+        inviteHelper.sendNominatedInvitation(invitationId, variables);
     }
     
 }
diff --git a/source/java/org/alfresco/repo/invitation/site/SendInviteAction.java b/source/java/org/alfresco/repo/invitation/site/SendInviteAction.java
index 4f6e596beb..0a44b95de3 100644
--- a/source/java/org/alfresco/repo/invitation/site/SendInviteAction.java
+++ b/source/java/org/alfresco/repo/invitation/site/SendInviteAction.java
@@ -21,6 +21,8 @@ package org.alfresco.repo.invitation.site;
 
 import java.util.Map;
 
+import org.alfresco.repo.workflow.jbpm.JBPMEngine;
+import org.jbpm.context.exe.ContextInstance;
 import org.jbpm.graph.exe.ExecutionContext;
 
 public class SendInviteAction extends AbstractInvitationAction
@@ -30,8 +32,11 @@ public class SendInviteAction extends AbstractInvitationAction
     @SuppressWarnings("unchecked")
     public void execute(final ExecutionContext context) throws Exception
     {
-        Map<String, Object> executionVariables = context.getContextInstance().getVariables();
-        inviteHelper.sendNominatedInvitation(executionVariables);
+        ContextInstance contextInstance = context.getContextInstance();
+        long processId = contextInstance.getProcessInstance().getId();
+        String inviteId = JBPMEngine.ENGINE_ID + "$" + processId;
+        Map<String, Object> executionVariables = contextInstance.getVariables();
+        inviteHelper.sendNominatedInvitation(inviteId, executionVariables);
     }
 
 }