diff --git a/library/include/mobilisis/calculator_functions.h b/library/include/mobilisis/calculator_functions.h
index c97f046..601053a 100644
--- a/library/include/mobilisis/calculator_functions.h
+++ b/library/include/mobilisis/calculator_functions.h
@@ -61,7 +61,7 @@ public:
     }
 
 // testing public:
-//private:
+private:
     // Introduced for PaymentMethod::Steps (e.g. Schoenau)
     // For tariff of following structure: only steps, no special days, nonstop.
     uint32_t GetCostFromDuration(Configuration *cfg, QDateTime const &start, quint64 durationMinutes) const;