diff --git a/library/include/mobilisis/configuration.h b/library/include/mobilisis/configuration.h
index ea3cde7..3c4966e 100644
--- a/library/include/mobilisis/configuration.h
+++ b/library/include/mobilisis/configuration.h
@@ -58,7 +58,8 @@ public:
 	/// <returns>Returns operation status bool (OK | FAIL) </returns>
 	bool ParseJson(Configuration* cfg, const char* json);
 
-    ATBPaymentOption const &getPaymentOptions();
+    ATBPaymentOption &getPaymentOptions();
+    ATBPaymentOption const &getPaymentOptions() const;
     QVector<ATBDailyTicket> const &getDailyTickets() const;
 
 private: