diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 7939d463a3c..5531a188202 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -1411,6 +1411,7 @@ class AccountInvoiceTax(models.Model):
     base = fields.Monetary(string='Base', compute='_compute_base_amount')
 
     # DO NOT FORWARD-PORT!!! ONLY FOR v10
+    @api.model
     def create(self, vals):
         inv_tax = super(AccountInvoiceTax, self).create(vals)
         # Workaround to make sure the tax amount is rounded to the currency precision since the ORM