diff --git a/Detectors/Upgrades/ITS3/simulation/src/Digitizer.cxx b/Detectors/Upgrades/ITS3/simulation/src/Digitizer.cxx
index b91e17890a6d8..9c4b6b1f828cf 100644
--- a/Detectors/Upgrades/ITS3/simulation/src/Digitizer.cxx
+++ b/Detectors/Upgrades/ITS3/simulation/src/Digitizer.cxx
@@ -90,7 +90,7 @@ void Digitizer::init()
     } else {
       LOGP(fatal, "ResponseFunction '{}' not implemented!", func);
     }
-    mSimRespIBShift = mSimRespIB->getDepthMax() - constants::silicon::thickness / 2.f;
+    mSimRespIBShift = mSimRespIB->getDepthMax() - constants::silicon::thickness / 2.f - mSimRespIB->getRespCentreDep();
     mSimRespOBShift = mSimRespOB->getDepthMax() - SegmentationOB::SensorLayerThickness / 2.f;
   }