diff --git a/partner_fax/models/res_partner.py b/partner_fax/models/res_partner.py
index 3072830e5..ca1c567b8 100644
--- a/partner_fax/models/res_partner.py
+++ b/partner_fax/models/res_partner.py
@@ -9,3 +9,9 @@ class ResPartner(models.Model):
     _inherit = 'res.partner'
 
     fax = fields.Char()
+
+class ResCompany(models.Model):
+
+    _inherit = 'res.company'
+
+    fax = fields.Char()