diff --git a/DDDB/include/Detector/DeVP.h b/DDDB/include/Detector/DeVP.h
index bda06044b0e474b91883e1f6386fffade709c151..678763ac81c7cd6fb3e5befaff4e8e92062d87f1 100644
--- a/DDDB/include/Detector/DeVP.h
+++ b/DDDB/include/Detector/DeVP.h
@@ -50,7 +50,7 @@ namespace gaudi   {
       /// Standard constructors and assignment
       DE_CTORS_DEFAULT(DeVPStaticObject);
       /// Initialization of sub-classes
-      virtual void initialize();
+      virtual void initialize()  override;
       /// Printout method to stdout
       virtual void print(int indent, int flags)  const override;
     };
@@ -109,9 +109,9 @@ namespace gaudi   {
       /// Standard constructors and assignment
       DE_CTORS_DEFAULT(DeVPObject);
       /// Initialization of sub-classes
-      virtual void initialize();
+      virtual void initialize()  override;
       /// Printout method to stdout
-      void print(int indent, int flags)  const;
+      void print(int indent, int flags)  const  override;
     };
   }    // End namespace detail
 
diff --git a/DDDB/include/Detector/DeVPGeneric.h b/DDDB/include/Detector/DeVPGeneric.h
index 6adf91ab32a128353f2c336253200bc8b55ac70d..b03964c45eaa71faf0d24fcb4086d684c6a72a0f 100644
--- a/DDDB/include/Detector/DeVPGeneric.h
+++ b/DDDB/include/Detector/DeVPGeneric.h
@@ -45,9 +45,9 @@ namespace gaudi   {
       /// Standard constructors and assignment
       DE_CTORS_DEFAULT(DeVPGenericStaticObject);
       /// Initialization of sub-classes
-      virtual void initialize();
+      virtual void initialize()  override;
       /// Printout method to stdout
-      void print(int indent, int flg)  const;
+      virtual void print(int indent, int flg)  const  override;
     };
   }    // End namespace detail
 
@@ -98,9 +98,9 @@ namespace gaudi   {
       /// Standard constructors and assignment
       DE_CTORS_DEFAULT(DeVPGenericObject);
       /// Initialization of sub-classes
-      virtual void initialize();
+      virtual void initialize()  override;
       /// Printout method to stdout
-      void print(int indent, int flg)  const;
+      virtual void print(int indent, int flg)  const  override;
     };
   }    // End namespace detail
 
diff --git a/DDDB/src/Detector/DeHandles.cpp b/DDDB/src/Detector/DeHandles.cpp
index cfed91afeb64cfa06cd46e3be10e9f380338585d..a0998e9dadd2a753074249fbcad3201914cd7a83 100644
--- a/DDDB/src/Detector/DeHandles.cpp
+++ b/DDDB/src/Detector/DeHandles.cpp
@@ -33,15 +33,14 @@ DD4HEP_INSTANTIATE_HANDLE_UNNAMED(DeVPSensorObject,DeIOVObject,ConditionObject);
 DD4HEP_INSTANTIATE_HANDLE_UNNAMED(DeVPGenericObject,DeIOVObject,ConditionObject);
 DD4HEP_INSTANTIATE_HANDLE_UNNAMED(DeVPObject,DeVPGenericObject,DeIOVObject,ConditionObject);
 
+inline std::ostream& operator << (std::ostream& s, const DeVPStaticObject&)        { return s; }
+inline std::ostream& operator << (std::ostream& s, const DeVPSensorStaticObject&)  { return s; }
+inline std::ostream& operator << (std::ostream& s, const DeVPGenericStaticObject&) { return s; }
+inline std::ostream& operator << (std::ostream& s, const DeVPObject&)              { return s; }
+inline std::ostream& operator << (std::ostream& s, const DeVPSensorObject&)        { return s; }
+inline std::ostream& operator << (std::ostream& s, const DeVPGenericObject&)       { return s; }
 
 #include "Parsers/Parsers.h"
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPStaticObject)
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPSensorStaticObject)
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPGenericStaticObject)
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPObject)
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPSensorObject)
-DD4HEP_DEFINE_OSTREAM_DUMMY(DeVPGenericObject)
-
 DD4HEP_DEFINE_PARSER_DUMMY(DeVPStaticObject)
 DD4HEP_DEFINE_PARSER_DUMMY(DeVPSensorStaticObject)
 DD4HEP_DEFINE_PARSER_DUMMY(DeVPGenericStaticObject)