diff --git a/include/wx/mac/dataobj.h b/include/wx/mac/dataobj.h
index 3c1e8de47b..d0986d168e 100644
--- a/include/wx/mac/dataobj.h
+++ b/include/wx/mac/dataobj.h
@@ -20,7 +20,7 @@
 // wxDataObject is the same as wxDataObjectBase under wxGTK
 // ----------------------------------------------------------------------------
 
-class wxDataObject : public wxDataObjectBase
+class WXDLLEXPORT wxDataObject : public wxDataObjectBase
 {
 public:
     wxDataObject();
diff --git a/include/wx/mac/dataobj2.h b/include/wx/mac/dataobj2.h
index 744aa141ae..c6fd53689c 100644
--- a/include/wx/mac/dataobj2.h
+++ b/include/wx/mac/dataobj2.h
@@ -20,7 +20,7 @@
 // wxBitmapDataObject is a specialization of wxDataObject for bitmaps
 // ----------------------------------------------------------------------------
 
-class wxBitmapDataObject : public wxBitmapDataObjectBase
+class WXDLLEXPORT wxBitmapDataObject : public wxBitmapDataObjectBase
 {
 public:
     // ctors
@@ -64,7 +64,7 @@ private:
 // wxFileDataObject is a specialization of wxDataObject for file names
 // ----------------------------------------------------------------------------
 
-class wxFileDataObject : public wxFileDataObjectBase
+class WXDLLEXPORT wxFileDataObject : public wxFileDataObjectBase
 {
 public:
     // implement base class pure virtuals