diff --git a/addons/hr_evaluation/hr_evaluation.py b/addons/hr_evaluation/hr_evaluation.py
index b13e90cd627..eece0c7497e 100644
--- a/addons/hr_evaluation/hr_evaluation.py
+++ b/addons/hr_evaluation/hr_evaluation.py
@@ -291,6 +291,7 @@ survey_request()
 class hr_evaluation_interview(osv.osv):
     _name = 'hr.evaluation.interview'
     _inherits = {'survey.request': 'request_id'}
+    _inherit =  'mail.thread'
     _rec_name = 'request_id'
     _description = 'Appraisal Interview'
     _columns = {