diff --git a/DDG4/include/DDG4/DDG4Dict.h b/DDG4/include/DDG4/DDG4Dict.h
index 463ef1a65..5bfb3ddfb 100644
--- a/DDG4/include/DDG4/DDG4Dict.h
+++ b/DDG4/include/DDG4/DDG4Dict.h
@@ -65,9 +65,6 @@ namespace { class DDG4Dict {};   }
 /// Dictionaires for Geant4 particles
 #pragma link C++ class dd4hep::sim::ParticleExtension+;
 
-/// Auto-pointers related. ROOT cannot handle I/O!
-#pragma link C++ class dd4hep::dd4hep_ptr<dd4hep::sim::DataExtension>;
-
 #pragma link C++ class dd4hep::sim::Geant4Particle+;
 #pragma link C++ class std::vector<dd4hep::sim::Geant4Particle*>+;
 #pragma link C++ class std::map<int,dd4hep::sim::Geant4Particle*>+;