diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 48f7756c7e5..a3aadfe7fa7 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -41,7 +41,7 @@ MAGIC_COLUMNS = ('id', 'create_uid', 'create_date', 'write_uid', 'write_date')
 
 class AccountInvoice(models.Model):
     _name = "account.invoice"
-    _inherit = ['mail.thread', 'mail.activity.mixin', 'portal.mixin']
+    _inherit = ['portal.mixin', 'mail.thread', 'mail.activity.mixin']
     _description = "Invoice"
     _order = "date_invoice desc, number desc, id desc"