diff --git a/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSD.h b/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSD.h
index 1a4c3410976fc92b0ea63abb5afeec716db9e01d..ee742efedf1447cde24ad14d664d911157a0a840 100644
--- a/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSD.h
+++ b/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSD.h
@@ -45,6 +45,7 @@ namespace FCS_Param {
 
     // Merging properties
     double            m_maxRadius=25.;                //!< property, see @link LArG4GenShowerLib::LArG4GenShowerLib @endlink
+    double            m_maxRadiusFine=1.;             //!< property, see @link LArG4GenShowerLib::LArG4GenShowerLib @endlink
     double            m_maxRadiusLAr=25.;             //!< property, see @link LArG4GenShowerLib::LArG4GenShowerLib @endlink
     double            m_maxRadiusHEC=100.;             //!< property, see @link LArG4GenShowerLib::LArG4GenShowerLib @endlink
     double            m_maxRadiusFCAL=100.;            //!< property, see @link LArG4GenShowerLib::LArG4GenShowerLib @endlink
diff --git a/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSDTool.cxx b/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSDTool.cxx
index 0068ce2db88ba7a9278f0f84cb0b1700916521cf..0426231ce438c151460149aee4c5fedf5be1f537 100644
--- a/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSDTool.cxx
+++ b/Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimSD/src/FCS_StepInfoSDTool.cxx
@@ -92,6 +92,7 @@ namespace FCS_Param
     declareProperty("shorten_lar_step",m_config.shorten_lar_step, "");
 
     declareProperty("maxRadius",m_config.m_maxRadius, "");
+    declareProperty("maxRadiusFine",m_config.m_maxRadiusFine, "");
     declareProperty("maxRadiusLAr",m_config.m_maxRadiusLAr, "");
     declareProperty("maxRadiusHEC",m_config.m_maxRadiusHEC, "");
     declareProperty("maxRadiusFCAL",m_config.m_maxRadiusFCAL, "");