diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index 090ac11..d4bde75 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -28,6 +28,8 @@ CalcState CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char cons
     *tariff = new Configuration();
 
     CalcState calcState;
+#if __linux__
+
     int const zone = get_zone_nr();
 
     // DEBUG
@@ -49,6 +51,9 @@ CalcState CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char cons
     memset(buffer, 0x00, sizeof(buffer));
     snprintf(buffer, sizeof(buffer)-1, "tariff%02d.json", zone);
     confFile += buffer;
+#else // windows
+    QString confFile(config_file);
+#endif
 
     // DEBUG
     qCritical() << "      ... confFile = " << confFile;