diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index c9da7df..7e2605d 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -173,9 +173,9 @@ int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int cu
 
         qCritical() << "     compute_next_timestep() firstDurationStep:" << firstDurationStep;
 
-        int nextTimeStep = currentTimeMinutes + firstDurationStep;
+        int const nextTimeStep = currentTimeMinutes + firstDurationStep;
 
-        if (currentTimeMinutes >= minParkingTime && nextTimeStep <= maxParkingTime) {
+        if (nextTimeStep >= minParkingTime && nextTimeStep <= maxParkingTime) {
             qCritical() << "          compute_next_timestep() nextTimeStep:" << nextTimeStep;
             return nextTimeStep;
         }