diff --git a/SimG4Core/CustomPhysics/interface/CMSSIMPInelasticXS.h b/SimG4Core/CustomPhysics/interface/CMSSIMPInelasticXS.h
index b979d0ced2700..9dfa38287b386 100644
--- a/SimG4Core/CustomPhysics/interface/CMSSIMPInelasticXS.h
+++ b/SimG4Core/CustomPhysics/interface/CMSSIMPInelasticXS.h
@@ -25,8 +25,6 @@ class CMSSIMPInelasticXS : public G4VCrossSectionDataSet {
                               const G4Element* elm,
                               const G4Material* mat) override;
 
-  G4Isotope* SelectIsotope(const G4Element*, G4double kinEnergy) override;
-
   void BuildPhysicsTable(const G4ParticleDefinition&) override;
 
 private:
diff --git a/SimG4Core/CustomPhysics/src/CMSSIMPInelasticProcess.cc b/SimG4Core/CustomPhysics/src/CMSSIMPInelasticProcess.cc
index 769819b9c8b9a..37e473aa756c0 100644
--- a/SimG4Core/CustomPhysics/src/CMSSIMPInelasticProcess.cc
+++ b/SimG4Core/CustomPhysics/src/CMSSIMPInelasticProcess.cc
@@ -52,8 +52,8 @@ G4VParticleChange* CMSSIMPInelasticProcess::PostStepDoIt(const G4Track& aTrack,
   aParticle->SetDefinition(G4Neutron::Neutron());
 
   G4Nucleus* target = GetTargetNucleusPointer();
-  G4Material* aMaterial = aTrack.GetMaterial();
-  G4Element* anElement = GetCrossSectionDataStore()->SampleZandA(aParticle, aMaterial, *target);
+  const G4Material* aMaterial = aTrack.GetMaterial();
+  const G4Element* anElement = GetCrossSectionDataStore()->SampleZandA(aParticle, aMaterial, *target);
 
   // Next check for illegal track status
   //
@@ -72,7 +72,7 @@ G4VParticleChange* CMSSIMPInelasticProcess::PostStepDoIt(const G4Track& aTrack,
 
   // Initialize the hadronic projectile from the track
   thePro.Initialise(aTrack);
-  G4HadronicInteraction* anInteraction = ChooseHadronicInteraction(thePro, *target, aMaterial, anElement);
+  G4HadronicInteraction* anInteraction = GetHadronicInteractionList()[0];
 
   G4HadFinalState* result = nullptr;
   G4int reentryCount = 0;
diff --git a/SimG4Core/CustomPhysics/src/CMSSIMPInelasticXS.cc b/SimG4Core/CustomPhysics/src/CMSSIMPInelasticXS.cc
index 19296bfbb418a..6fccfdbb03603 100644
--- a/SimG4Core/CustomPhysics/src/CMSSIMPInelasticXS.cc
+++ b/SimG4Core/CustomPhysics/src/CMSSIMPInelasticXS.cc
@@ -39,10 +39,6 @@ G4double CMSSIMPInelasticXS::GetIsoCrossSection(const G4DynamicParticle* aPartic
   return nXsection->GetIsoCrossSection(aParticle, Z, A, iso, elm, mat);
 }
 
-G4Isotope* CMSSIMPInelasticXS::SelectIsotope(const G4Element* anElement, G4double kinEnergy) {
-  return nXsection->SelectIsotope(anElement, kinEnergy);
-}
-
 void CMSSIMPInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p) {
   if (isInitialized) {
     return;