diff --git a/l10n_br_account_product/sped/nfe/document.py b/l10n_br_account_product/sped/nfe/document.py
index 328fac7e297e..c7c6904bf066 100644
--- a/l10n_br_account_product/sped/nfe/document.py
+++ b/l10n_br_account_product/sped/nfe/document.py
@@ -861,7 +861,9 @@ def _details_pag_data(self, invoice):
 
     def _invoice_data(self, invoice):
         self.nfe.infNFe.cobr.fat.vLiq.valor = str(invoice.amount_total)
-        self.nfe.infNFe.cobr.fat.nFat.valor = str(invoice.internal_number or '')
+        self.nfe.infNFe.cobr.fat.nFat.valor = str(
+            invoice.internal_number or ''
+        )
         self.nfe.infNFe.cobr.fat.vOrig.valor = str(invoice.amount_total)
         # TODO - mapear/implementar vDesc
         self.nfe.infNFe.cobr.fat.vDesc.valor = str('0.00')