diff --git a/FullSimLight/include/FSLDetectorConstruction.hh b/FullSimLight/include/FSLDetectorConstruction.hh
index e4e40d261b9d0ce3333421407a2cdd7f6c72a197..6456f7617fe2edb71af52ceba32779f7c11bc6b6 100644
--- a/FullSimLight/include/FSLDetectorConstruction.hh
+++ b/FullSimLight/include/FSLDetectorConstruction.hh
@@ -99,7 +99,9 @@ public:
   void SetTolerance (const G4double tolerance){fTolerance=tolerance;}
   void SetOutputGDMLFileName(const G4String &outputGDMLFileName)     { fOutputGDMLFileName = outputGDMLFileName; }
   void SetDumpGDML(const bool dumpGDML)              {fDumpGDML=dumpGDML;}
-  void SetDeltaChord(const G4double DeltaChord) {fDeltaChord=DeltaChord;} //////////added
+  void SetDeltaChord(const G4double &parDeltaChord) {fDeltaChord=parDeltaChord;} //////////added
+ /////////Changes///////////
+ //void SetDeltaChord(const std::string DeltaChord);
   /// Common method to construct a driver with a stepper of requested type.
   G4VIntegrationDriver*
   createDriverAndStepper(std::string stepperType) const;