diff --git a/addons/l10n_ar/models/account_fiscal_position.py b/addons/l10n_ar/models/account_fiscal_position.py
index 82b7b7618ef..7c21abba2cb 100644
--- a/addons/l10n_ar/models/account_fiscal_position.py
+++ b/addons/l10n_ar/models/account_fiscal_position.py
@@ -11,6 +11,7 @@ class AccountFiscalPosition(models.Model):
         string='AFIP Responsibility Types', help='List of AFIP responsibilities where this fiscal position '
         'should be auto-detected')
 
+    @api.model
     def get_fiscal_position(self, partner_id, delivery_id=None):
         """ Take into account the partner afip responsibility in order to auto-detect the fiscal position """
         company = self.env.company