diff --git a/product/CMFActivity/ActivityTool.py b/product/CMFActivity/ActivityTool.py
index f24aa7b1c17ddbd4b44791d8f99b108d68bc68dd..0878eb1ab552028dde87b64aab7054e15ed126c0 100644
--- a/product/CMFActivity/ActivityTool.py
+++ b/product/CMFActivity/ActivityTool.py
@@ -308,9 +308,7 @@ class Message(BaseMessage):
                                    context=activity_tool)
           else:
             # Store site info
-            portal = getattr(obj, 'getPortalObject', lambda:None)()
-            if portal is not None:
-              setSite(portal)
+            setSite(activity_tool.getParentValue())
             if activity_tool.activity_timing_log:
               result = activity_timing_method(method, self.args, self.kw)
             else: