1 files changed, 5 insertions, 3 deletions
diff --git a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
index b5f18fa890..d82688c9c2 100644
--- a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
+++ b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
@@ -26,17 +26,19 @@
 #include <gtkmm/treeselection.h>
 #include <gtkmm/selectiondata.h>
 
+#include "gtkmm2ext/visibility.h"
+
 namespace Gtkmm2ext {
 
 template<class DataType>
-struct SerializedObjectPointers {
+struct /*LIBGTKMM2EXT_API*/ SerializedObjectPointers {
     uint32_t size;
     uint32_t cnt;
     char     type[32];
     DataType data[0];
 };
 
-class DnDTreeViewBase : public Gtk::TreeView 
+class LIBGTKMM2EXT_API DnDTreeViewBase : public Gtk::TreeView 
 {
   private:
   public:
@@ -87,7 +89,7 @@ class DnDTreeViewBase : public Gtk::TreeView
 };
 
 template<class DataType>
-class DnDTreeView : public DnDTreeViewBase
+class /*LIBGTKMM2EXT_API*/ DnDTreeView : public DnDTreeViewBase
 {
   public:
 	DnDTreeView() {}