diff --git a/l10n_br_base/models/res_partner.py b/l10n_br_base/models/res_partner.py
index a1c82783f951..5a045cf4a1cf 100644
--- a/l10n_br_base/models/res_partner.py
+++ b/l10n_br_base/models/res_partner.py
@@ -94,7 +94,7 @@ def _check_cnpj_inscr_est(self):
                         for partner in record.env["res.partner"].search(domain):
                             if (
                                 partner.inscr_est == record.inscr_est
-                                and not record.inscr_est
+                                and record.inscr_est
                             ):
                                 raise ValidationError(
                                     _(