diff --git a/k4FWCore/include/k4FWCore/DataHandle.h b/k4FWCore/include/k4FWCore/DataHandle.h
index 8dfd31af..a3803550 100644
--- a/k4FWCore/include/k4FWCore/DataHandle.h
+++ b/k4FWCore/include/k4FWCore/DataHandle.h
@@ -39,7 +39,7 @@ template <typename T> class DataHandle : public DataObjectHandle<DataWrapper<T>>
 
 public:
   DataHandle();
-  ~DataHandle();
+  ~DataHandle() override;
 
   /// Initialises mother class
   DataHandle(DataObjID& descriptor, Gaudi::DataHandle::Mode a, IDataHandleHolder* fatherAlg);
diff --git a/k4FWCore/include/k4FWCore/DataWrapper.h b/k4FWCore/include/k4FWCore/DataWrapper.h
index 59511bc3..0ecfb248 100644
--- a/k4FWCore/include/k4FWCore/DataWrapper.h
+++ b/k4FWCore/include/k4FWCore/DataWrapper.h
@@ -21,7 +21,6 @@
 
 #include <type_traits>
 
-// Include files
 #include "GaudiKernel/DataObject.h"
 #include "podio/CollectionBase.h"
 
@@ -50,7 +49,7 @@ template <class T> class GAUDI_API DataWrapper : public DataWrapperBase {
     uptr.release();
     is_owner = false;
   }
-  virtual ~DataWrapper();
+  virtual ~DataWrapper() override;
 
   const T* getData() const { return m_data; }
   void     setData(const T* data) { m_data = data; }