diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index bad4a98..b3365d1 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -476,6 +476,7 @@ CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
 
     // DEBUG
     qCritical() << "compute_price_for_parking_ticket() " << endl
+                << "          paymentOptionIndex: " << paymentOptionIndex << endl
                 << "          start_parking_time: " << start_parking_time << endl
                 << "          netto_parking_time: " << netto_parking_time << endl
                 << "                      minMin: " << minMin << endl
@@ -502,7 +503,7 @@ CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
 
     double cost = -1;
     if (start_parking_time.isValid()) {
-        if (tariff->getPaymentOptions().pop_payment_method_id == PaymentMethod::Steps) {
+        if (tariff->getPaymentOptions(paymentOptionIndex).pop_payment_method_id == PaymentMethod::Steps) {
             // hier muesste man unterscheiden: uebertrag oder nicht?
             calcState = Calculator::GetInstance().isParkingAllowed(tariff, start_parking_time,
                                                                    netto_parking_time, paymentOptionIndex);