diff --git a/library/include/mobilisis/calculator_functions.h b/library/include/mobilisis/calculator_functions.h
index cd526f4..8b13d4e 100644
--- a/library/include/mobilisis/calculator_functions.h
+++ b/library/include/mobilisis/calculator_functions.h
@@ -35,6 +35,8 @@ public:
     void ResetPriceSteps() { m_priceSteps.clear(); }
     QList<int> priceSteps() const { return m_priceSteps; }
 
+    CalcState isParkingAllowed(Configuration const *cfg, QDateTime const &start);
+
 	/// <summary>
 	/// Gets duration in seconds from cost
 	/// </summary>