diff --git a/include/wx/mac/carbon/dataform.h b/include/wx/mac/carbon/dataform.h
index 6942871ad9..d2c0f363cf 100644
--- a/include/wx/mac/carbon/dataform.h
+++ b/include/wx/mac/carbon/dataform.h
@@ -19,6 +19,7 @@ public:
 
     wxDataFormat();
     wxDataFormat(wxDataFormatId vType);
+    wxDataFormat(const wxDataFormat& rFormat);
     wxDataFormat(const wxString& rId);
     wxDataFormat(const wxChar* pId);
     wxDataFormat(NativeFormat vFormat);
@@ -36,6 +37,8 @@ public:
     bool operator!=(wxDataFormatId format) const
         { return m_type != (wxDataFormatId)format; }
 
+    wxDataFormat& operator=(const wxDataFormat& format);
+
     // explicit and implicit conversions to NativeFormat which is one of
     // standard data types (implicit conversion is useful for preserving the
     // compatibility with old code)
diff --git a/src/mac/carbon/dataobj.cpp b/src/mac/carbon/dataobj.cpp
index 9e26c3c802..e9aa12084b 100644
--- a/src/mac/carbon/dataobj.cpp
+++ b/src/mac/carbon/dataobj.cpp
@@ -67,6 +67,16 @@ wxDataFormat::wxDataFormat( const wxString& rId )
     SetId( rId );
 }
 
+wxDataFormat::wxDataFormat(const wxDataFormat& rFormat)
+{
+    if ( rFormat.m_format )
+        m_format = (NativeFormat) CFStringCreateCopy(NULL, (CFStringRef)rFormat.m_format);
+    else
+        m_format = 0;
+    m_type = rFormat.m_type;
+    m_id = rFormat.m_id;
+}
+
 wxDataFormat::wxDataFormat( NativeFormat vFormat )
 {
     m_format = 0;
@@ -87,6 +97,20 @@ wxDataFormat::~wxDataFormat()
 // http://developer.apple.com/qa/qa2005/qa1406.html
 // TODO : Use UTCoreTypes.h constants once we support 10.4+ only
 
+wxDataFormat& wxDataFormat::operator=(const wxDataFormat& rFormat)
+{
+    if ( m_format != 0 )
+    {
+        CFRelease( (CFStringRef) m_format );
+        m_format = 0;
+    }
+    if ( rFormat.m_format )
+        m_format = (NativeFormat) CFStringCreateCopy(NULL, (CFStringRef)rFormat.m_format);
+    m_type = rFormat.m_type;
+    m_id = rFormat.m_id;
+    return *this;
+}
+
 void wxDataFormat::SetType( wxDataFormatId dataType )
 {
     m_type = dataType;