diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 71c4a89..bbdf267 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -1890,7 +1890,7 @@ QList<int> Calculator::GetTimeSteps(Configuration *cfg, int paymentOptionIndex)
                                     qCritical() << "(" << __func__ << ":" << __LINE__ << ") configured minimal parking time:" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;
 
                                     // set dynamic minimal parking time
-                                    cfg->getPaymentOptions().pop_min_time = timeStep;
+                                    cfg->getPaymentOptions(paymentOptionIndex).pop_min_time = timeStep;
 
                                     qCritical() << "(" << __func__ << ":" << __LINE__ << ") computed minimal parking time:" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;