diff --git a/addons/hr/mail_message.py b/addons/hr/mail_message.py
index 37b6304526c..c102d573a4b 100644
--- a/addons/hr/mail_message.py
+++ b/addons/hr/mail_message.py
@@ -32,9 +32,11 @@ class mail_message(osv.Model):
         """If the user posting the message to an employee  is an employee, only
         the read access are checked"""
 
-        employee_ids = model_obj.search(cr, uid, [('user_id', '=', int(uid))], context=context)
-        if len(employee_ids) > 0:
-            model_obj.check_access_rights(cr, uid, 'read')
-            model_obj.check_access_rule(cr, uid, mids, 'read', context=context)
-        else:
-            super(mail_message, self).check_related_document(cr, uid, uid, model_obj, mids, operation, context)
+        if model_obj._name == 'hr.employee':
+            employee_ids = model_obj.search(cr, uid, [('user_id', '=', uid)], context=context)
+            if len(employee_ids) > 0:
+                model_obj.check_access_rights(cr, uid, 'read')
+                model_obj.check_access_rule(cr, uid, mids, 'read', context=context)
+                return
+
+        super(mail_message, self).check_related_document(cr, uid, uid, model_obj, mids, operation, context)