diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1148e1c63..cac2e1408 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -170,7 +170,7 @@ IF( NOT SIO_FOUND )
   include(FetchContent)
   FetchContent_Declare(sio_extern
   GIT_REPOSITORY https://github.com/iLCSoft/SIO.git
-  GIT_TAG v00-01
+  GIT_TAG v00-02
   GIT_SHALLOW 1
 #  FIND_PACKAGE_ARGS
 )
diff --git a/src/cpp/include/IMPL/AccessChecked.h b/src/cpp/include/IMPL/AccessChecked.h
index 3cb5fc988..ada5e8dd9 100644
--- a/src/cpp/include/IMPL/AccessChecked.h
+++ b/src/cpp/include/IMPL/AccessChecked.h
@@ -22,6 +22,7 @@ namespace IMPL {
     
   public:
     AccessChecked() ;
+    AccessChecked(const AccessChecked&) = default;
     virtual ~AccessChecked() = default;
     virtual int simpleUID() const { return _id ; }
 
diff --git a/src/cpp/src/IMPL/TrackImpl.cc b/src/cpp/src/IMPL/TrackImpl.cc
index ef0b6824b..097238283 100644
--- a/src/cpp/src/IMPL/TrackImpl.cc
+++ b/src/cpp/src/IMPL/TrackImpl.cc
@@ -20,7 +20,7 @@ namespace IMPL {
         }
 
   // copy constructor
-  TrackImpl::TrackImpl(const TrackImpl& o)
+  TrackImpl::TrackImpl(const TrackImpl& o) : AccessChecked(o)
   { 
 
       *this = o ; // call operator =