diff --git a/addons/l10n_ar/models/res_partner.py b/addons/l10n_ar/models/res_partner.py
index dd4d7aee514..50adb05dc1f 100644
--- a/addons/l10n_ar/models/res_partner.py
+++ b/addons/l10n_ar/models/res_partner.py
@@ -52,7 +52,7 @@ class ResPartner(models.Model):
         one is not found """
         recs_ar_vat = self.filtered(lambda x: x.l10n_latam_identification_type_id.l10n_ar_afip_code == '80')
         for rec in recs_ar_vat:
-            rec.l10n_ar_vat = rec.vat
+            rec.l10n_ar_vat = stdnum.ar.cuit.compact(rec.vat)
         remaining = self - recs_ar_vat
         remaining.l10n_ar_vat = False