diff --git a/addons/base_status/base_stage.py b/addons/base_status/base_stage.py
index 529e70fdb49..5f9fd57ffe5 100644
--- a/addons/base_status/base_stage.py
+++ b/addons/base_status/base_stage.py
@@ -297,7 +297,7 @@ class base_stage(object):
                 destination=False)
 
     def remind_user(self, cr, uid, ids, context=None, attach=False, destination=True):
-        if 'message_post' in self:
+        if hasattr(self, 'message_post'):
             for case in self.browse(cr, uid, ids, context=context):
                 if destination:
                     recipient_id = case.user_id.partner_id.id
diff --git a/addons/crm_helpdesk/crm_helpdesk.py b/addons/crm_helpdesk/crm_helpdesk.py
index 612537bdb77..9bd56cf3944 100644
--- a/addons/crm_helpdesk/crm_helpdesk.py
+++ b/addons/crm_helpdesk/crm_helpdesk.py
@@ -20,6 +20,7 @@
 ##############################################################################
 
 from base_status.base_state import base_state
+from base_status.base_stage import base_stage
 from crm import crm
 from osv import fields, osv
 import tools
@@ -31,7 +32,7 @@ CRM_HELPDESK_STATES = (
     crm.AVAILABLE_STATES[4][0], # Pending
 )
 
-class crm_helpdesk(base_state, osv.osv):
+class crm_helpdesk(base_state, base_stage, osv.osv):
     """ Helpdesk Cases """
 
     _name = "crm.helpdesk"