diff --git a/SimG4Core/CustomPhysics/src/FullModelHadronicProcess.cc b/SimG4Core/CustomPhysics/src/FullModelHadronicProcess.cc
index e9aabf5ca359b..dab14b56dcb23 100644
--- a/SimG4Core/CustomPhysics/src/FullModelHadronicProcess.cc
+++ b/SimG4Core/CustomPhysics/src/FullModelHadronicProcess.cc
@@ -9,6 +9,8 @@
 #include "G4Material.hh"
 #include "G4Element.hh"
 #include "G4Isotope.hh"
+#include "G4HadronicException.hh"
+#include "G4ReactionProduct.hh"
 
 using namespace CLHEP;
 
diff --git a/SimG4Core/CustomPhysics/src/FullModelReactionDynamics.cc b/SimG4Core/CustomPhysics/src/FullModelReactionDynamics.cc
index 6452eb9fa2c03..dc9e4797d6628 100644
--- a/SimG4Core/CustomPhysics/src/FullModelReactionDynamics.cc
+++ b/SimG4Core/CustomPhysics/src/FullModelReactionDynamics.cc
@@ -10,6 +10,8 @@
 #include <iostream>
 #include "G4ParticleTable.hh"
 #include "G4Poisson.hh"
+#include "G4HadronicException.hh"
+#include "G4ReactionProduct.hh"
 
 using namespace CLHEP;