diff --git a/Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx b/Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
index e9199813d6839..e7013d1a4b225 100644
--- a/Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
+++ b/Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
@@ -129,7 +129,7 @@ void Alice3Magnet::ConstructGeometry()
       mRestMaterialThickness = 6.8f;                   // cm
       mOuterWrapInnerRadius = 180.f;                   // cm
       mOuterWrapThickness = 3.f;                       // cm
-      mZLength = 750.f;                                // cm Length of the magnet (Z direction)
+      mZLength = 620.f;                                // cm Length of the magnet (Z direction)
       break;
     case o2::passive::MagnetLayout::MagReducedRadius:
       mInnerWrapInnerRadius = 125.f; // cm