diff --git a/include/MainWindow.h b/include/MainWindow.h
index 6b75a86a5..68c6dc24e 100644
--- a/include/MainWindow.h
+++ b/include/MainWindow.h
@@ -60,7 +60,7 @@ public:
 	void addSpacingToToolBar( int _size );
 
 	// wrap the widget with a window decoration and add it to the workspace
-	SubWindow* addWindowedWidget(QWidget *w, Qt::WindowFlags windowFlags=0);
+	EXPORT SubWindow* addWindowedWidget(QWidget *w, Qt::WindowFlags windowFlags=0);
 
 
 	///
diff --git a/include/SubWindow.h b/include/SubWindow.h
index 75e058584..821e0a762 100644
--- a/include/SubWindow.h
+++ b/include/SubWindow.h
@@ -32,13 +32,15 @@
 #include <QMdiSubWindow>
 #include <QRect>
 
+#include "export.h"
+
 
 class QMoveEvent;
 class QResizeEvent;
 class QWidget;
 
 
-class SubWindow : public QMdiSubWindow
+class EXPORT SubWindow : public QMdiSubWindow
 {
 	Q_OBJECT
 public: