diff --git a/DDG4/plugins/Geant4OpticalPhotonPhysics.cpp b/DDG4/plugins/Geant4OpticalPhotonPhysics.cpp
index 22eb4ce35f5ce5e4d9a040d8063df81c67d8f67f..52211d2c1f7ba8a1ad27eeac49a1de6c36c7a031 100644
--- a/DDG4/plugins/Geant4OpticalPhotonPhysics.cpp
+++ b/DDG4/plugins/Geant4OpticalPhotonPhysics.cpp
@@ -39,6 +39,7 @@
 #include "G4ParticleTypes.hh"
 #include "G4ParticleTable.hh"
 #include "G4ProcessManager.hh"
+#include "G4Version.hh"
 
 #if G4VERSION_NUMBER >= 1070
 #include "G4OpticalParameters.hh"