diff --git a/include/wx/dataobj.h b/include/wx/dataobj.h
index 7c7aee91f9..923f297094 100644
--- a/include/wx/dataobj.h
+++ b/include/wx/dataobj.h
@@ -254,7 +254,7 @@ class WXDLLEXPORT wxDataObjectComposite : public wxDataObject
 {
 public:
     // ctor
-    wxDataObjectComposite() { m_preferred = 0; }
+    wxDataObjectComposite();
 
     // add data object (it will be deleted by wxDataObjectComposite, hence it
     // must be allocated on the heap) whose format will become the preferred
diff --git a/src/common/dobjcmn.cpp b/src/common/dobjcmn.cpp
index d2d6a4e5b7..661b8114dc 100644
--- a/src/common/dobjcmn.cpp
+++ b/src/common/dobjcmn.cpp
@@ -94,6 +94,13 @@ bool wxDataObjectBase::IsSupported(const wxDataFormat& format,
 // wxDataObjectComposite
 // ----------------------------------------------------------------------------
 
+wxDataObjectComposite::wxDataObjectComposite()
+{
+    m_preferred = 0;
+
+    m_dataObjects.DeleteContents(TRUE);
+}
+
 wxDataObjectSimple *
 wxDataObjectComposite::GetObject(const wxDataFormat& format) const
 {