diff --git a/NPSimulation/Detectors/Tiara/Tiara.hh b/NPSimulation/Detectors/Tiara/Tiara.hh
index 1f86097fdec9a1b3469e817c109335e591eadd81..58b838ac0429f4a63c337460d4765ef3c51fb4c0 100644
--- a/NPSimulation/Detectors/Tiara/Tiara.hh
+++ b/NPSimulation/Detectors/Tiara/Tiara.hh
@@ -50,7 +50,7 @@ namespace TIARA{
   const G4double ResoTime    = 0      ;
   const G4double ResoEnergyInnerBarrel  = 0.058*MeV ;// = 136keV of Resolution   //   Unit is MeV/2.35
   const G4double ResoEnergyOuterBarrel  = 0.058*MeV ;// = 136keV of Resolution   //   Unit is MeV/2.35
-  const G4double ResoEnergyHyball       = 0.001*MeV ;// =  87keV of Resolution   //   Unit is MeV/2.35
+  const G4double ResoEnergyHyball       = 0.029*MeV ;// =  70keV of Resolution   //   Unit is MeV/2.35
 
   const G4double EnergyThreshold = 200*keV;