diff --git a/src/datasets.cpp b/src/datasets.cpp
index d8cafb46..8cb09fed 100644
--- a/src/datasets.cpp
+++ b/src/datasets.cpp
@@ -608,6 +608,10 @@ namespace Exiv2 {
     {
     }
 
+    IptcKey::~IptcKey()
+    {
+    }
+
     IptcKey& IptcKey::operator=(const IptcKey& rhs)
     {
         if (this == &rhs) return *this;
diff --git a/src/datasets.hpp b/src/datasets.hpp
index 0730a1cb..7bd9e298 100644
--- a/src/datasets.hpp
+++ b/src/datasets.hpp
@@ -298,6 +298,8 @@ namespace Exiv2 {
         IptcKey(uint16_t tag, uint16_t record);
         //! Copy constructor
         IptcKey(const IptcKey& rhs);
+        //! Destructor
+        virtual ~IptcKey();
         //@}
 
         //! @name Manipulators
diff --git a/src/metadatum.cpp b/src/metadatum.cpp
index b0e070de..ed68a855 100644
--- a/src/metadatum.cpp
+++ b/src/metadatum.cpp
@@ -43,6 +43,10 @@ EXIV2_RCSID("@(#) $Id$")
 // class member definitions
 namespace Exiv2 {
 
+    Key::~Key()
+    {
+    }
+    
     Key::AutoPtr Key::clone() const
     {
         return AutoPtr(clone_());
diff --git a/src/metadatum.hpp b/src/metadatum.hpp
index c55b4a58..6b46c6a3 100644
--- a/src/metadatum.hpp
+++ b/src/metadatum.hpp
@@ -61,7 +61,7 @@ namespace Exiv2 {
         //! @name Creators
         //@{
         //! Destructor
-        virtual ~Key() {}
+        virtual ~Key();
         //@}
 
         //! @name Accessors
diff --git a/src/value.cpp b/src/value.cpp
index 043b4910..c54d667e 100644
--- a/src/value.cpp
+++ b/src/value.cpp
@@ -55,6 +55,10 @@ namespace Exiv2 {
     {
     }
 
+    Value::~Value()
+    {
+    }
+    
     Value& Value::operator=(const Value& rhs)
     {
         if (this == &rhs) return *this;
@@ -146,6 +150,21 @@ namespace Exiv2 {
         return toString();
     }
 
+    DataValue::DataValue(TypeId typeId) : Value(typeId) 
+    {
+    }
+    
+    DataValue::DataValue(const byte* buf,
+              long len, ByteOrder byteOrder,TypeId typeId)
+        : Value(typeId) 
+    { 
+        read(buf, len, byteOrder); 
+    }
+            
+    DataValue::~DataValue() 
+    {
+    }
+        
     int DataValue::read(const byte* buf, long len, ByteOrder /*byteOrder*/)
     {
         // byteOrder not needed
diff --git a/src/value.hpp b/src/value.hpp
index 8c762273..2c470f1a 100644
--- a/src/value.hpp
+++ b/src/value.hpp
@@ -69,7 +69,7 @@ namespace Exiv2 {
         //! Constructor, taking a type id to initialize the base class with
         explicit Value(TypeId typeId);
         //! Virtual destructor.
-        virtual ~Value() {}
+        virtual ~Value();
         //@}
         //! @name Manipulators
         //@{
@@ -268,14 +268,13 @@ namespace Exiv2 {
         //! @name Creators
         //@{
         //! Default constructor.
-        explicit DataValue(TypeId typeId =undefined) : Value(typeId) {}
+        explicit DataValue(TypeId typeId =undefined);
         //! Constructor
         DataValue(const byte* buf,
                   long len, ByteOrder byteOrder =invalidByteOrder,
-                  TypeId typeId =undefined)
-            : Value(typeId) { read(buf, len, byteOrder); }
+                  TypeId typeId =undefined);
         //! Virtual destructor.
-        virtual ~DataValue() {}
+        virtual ~DataValue();
         //@}
 
         //! @name Manipulators