diff --git a/NPSimulation/include/GaspardTrackerDummyShape.hh b/NPSimulation/include/GaspardTrackerDummyShape.hh
index dc4d9bf68745226378f710e42c5270160883e9b4..d567d9c1e65e66762dacc876069b1c2de6c16f0b 100644
--- a/NPSimulation/include/GaspardTrackerDummyShape.hh
+++ b/NPSimulation/include/GaspardTrackerDummyShape.hh
@@ -165,7 +165,7 @@ namespace GPDDUMMYSHAPE
    // for testing the excitation energy reconstruction
    const G4double FirstStageThickness  = 1.3*cm;
 //   const G4int NumberOfStrips	       = 128;
-   const G4int NumberOfStrips	       = 128;
+   const G4int NumberOfStrips	       = 20;
 
    // Second stage
    const G4double SecondStageFace      = FirstStageFace;