diff --git a/NPSimulation/Tiara/Tiara.cc b/NPSimulation/Tiara/Tiara.cc
index 519b066020c9575e45acbe0710e5254d5eb20905..7970be9f452b25d68cbe060d4b63468d15eda8a1 100644
--- a/NPSimulation/Tiara/Tiara.cc
+++ b/NPSimulation/Tiara/Tiara.cc
@@ -314,7 +314,7 @@ void Tiara::InitializeScorers(){
   G4VPrimitiveScorer* Hyball= new SILICONSCORERS::PS_Silicon_Annular("Hyball",1, 
       HYBALL_ActiveWafer_InnerRadius, 
       HYBALL_ActiveWafer_OuterRadius, 
-      -0.5*HYBALL_ActiveWafer_Angle,HYBALL_ActiveWafer_Angle, 
+      -0.5*HYBALL_ActiveWafer_Angle,0.5*HYBALL_ActiveWafer_Angle,
       HYBALL_NumberOfAnnularStrip,
       HYBALL_NumberOfRadialStrip);