diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 41045c0..83d9d26 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -510,12 +510,12 @@ Ticket Calculator::private_GetDurationFromCost(Configuration *cfg,
 
     static const PaymentMethod paymentMethodId = Utilities::getPaymentMethodId(cfg);
     static const bool carryOverNotSet = isCarryOverNotSet(cfg, paymentMethodId);
-    static const uint32_t minParkingTimeMinutes = std::max(getMinimalParkingTime(cfg, paymentMethodId), 0);
-    static const uint32_t maxParkingTimeMinutes = std::max(getMaximalParkingTime(cfg, paymentMethodId), 0);
+    static const uint32_t minParkingTimeMinutes = std::max(Utilities::getMinimalParkingTime(cfg, paymentMethodId), 0);
+    static const uint32_t maxParkingTimeMinutes = std::max(Utilities::getMaximalParkingTime(cfg, paymentMethodId), 0);
     static const uint32_t minParkingPrice = getMinimalParkingPrice(cfg, paymentMethodId);
     // static const bool checkMinMaxMinutes = (minParkingTimeMinutes < maxParkingTimeMinutes);
-    static const uint32_t weekDaysPrice = computeWeekDaysPrice(cfg, paymentMethodId);
-    static const uint32_t weekDaysDurationUnit = computeWeekDaysDurationUnit(cfg, paymentMethodId);
+    static const uint32_t weekDaysPrice = Utilities::computeWeekDaysPrice(cfg, paymentMethodId);
+    static const uint32_t weekDaysDurationUnit = Utilities::computeWeekDaysDurationUnit(cfg, paymentMethodId);
     static const uint32_t specialDaysDurationUnit = 60;
 
     if(cost < minParkingPrice) {