diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index 7f30d97..f2c43df 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -396,7 +396,7 @@ int CALCULATE_LIBRARY_API get_zone_nr(int zone)
     if(zone > -1) return zone;
     else
     {
-        QFile zone("/etc/zone_nr");
+        QFile zone("/mnt/system_data/zone_nr");
         if (zone.exists()) {
             QFileInfo finfo(zone);
             if (finfo.size() <= 4) { // decimal 000\n