diff --git a/SimG4Core/CustomPhysics/interface/APrimePhysics.h b/SimG4Core/CustomPhysics/interface/APrimePhysics.h
index 0aba48c2e63ac..698d091dc3006 100644
--- a/SimG4Core/CustomPhysics/interface/APrimePhysics.h
+++ b/SimG4Core/CustomPhysics/interface/APrimePhysics.h
@@ -1,5 +1,5 @@
-#ifndef SIMAPPLICATION_APRIMEPHYSICS_H_
-#define SIMAPPLICATION_APRIMEPHYSICS_H 1_
+#ifndef SIMG4CORE_CUSTOMPHYSICS_APRIMEPHYSICS_H
+#define SIMG4CORE_CUSTOMPHYSICS_APRIMEPHYSICS_H
 
 // Geant4
 #include "G4VPhysicsConstructor.hh"