diff --git a/go/svc/invoice/model.go b/go/svc/invoice/model.go
index 51fe850..d628e1a 100644
--- a/go/svc/invoice/model.go
+++ b/go/svc/invoice/model.go
@@ -105,11 +105,7 @@
 
 	invoice.State = pb.Invoice_STATE_SEALED
 	// TODO(q3k): this should be configurable.
-	if language == "pl" {
-		invoice.FinalUid = fmt.Sprintf("FV/%s", finalUid)
-	} else {
-		invoice.FinalUid = fmt.Sprintf("%s", finalUid)
-	}
+	invoice.FinalUid = fmt.Sprintf("FV/%s", finalUid)
 	invoice.Date = sealTime.UnixNano()
 	calculateInvoiceData(invoice)
 
@@ -230,7 +226,7 @@
 	}
 	if s.finalUid.Valid {
 		p.State = pb.Invoice_STATE_SEALED
-		p.FinalUid = fmt.Sprintf("%s", s.finalUid.String)
+		p.FinalUid = fmt.Sprintf("FV/%s", s.finalUid.String)
 		p.Date = s.sealedTime.Int64
 	} else {
 		p.State = pb.Invoice_STATE_PROFORMA