diff --git a/addons/crm/base_partner_merge.py b/addons/crm/base_partner_merge.py
index 321c5caa517..4f8b9dca6dd 100644
--- a/addons/crm/base_partner_merge.py
+++ b/addons/crm/base_partner_merge.py
@@ -9,6 +9,7 @@ import operator
 import psycopg2
 import re
 from ast import literal_eval
+from openerp.exceptions import ValidationError
 from openerp.tools import mute_logger
 
 # Validation Library https://pypi.python.org/pypi/validate_email/1.1