diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 0f42739e899..c22a2beb56b 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -1657,7 +1657,7 @@ class AccountInvoiceLine(models.Model):
             return
         if not self.product_id:
             fpos = self.invoice_id.fiscal_position_id
-            self.invoice_line_tax_ids = fpos.map_tax(self.account_id.tax_ids, partner=self.partner_id).ids
+            self.invoice_line_tax_ids = fpos.map_tax(self.account_id.tax_ids, partner=self.partner_id)
         elif not self.price_unit:
             self._set_taxes()