diff --git a/NPSimulation/Detectors/W1/W1.cc b/NPSimulation/Detectors/W1/W1.cc
index b17c92a330ce3622df11fb7e60c70f85674373e5..5e0f8debff07268db5f2a529b030efee04426707 100644
--- a/NPSimulation/Detectors/W1/W1.cc
+++ b/NPSimulation/Detectors/W1/W1.cc
@@ -70,10 +70,6 @@ W1::W1()
 W1::~W1()
 {
    delete m_Event;
-   delete m_MaterialAluminium;
-   delete m_MaterialSilicon;
-   delete m_MaterialIron;
-   delete m_MaterialVacuum ;
 }