diff --git a/src/gui/kernel/qshapedpixmapdndwindow.cpp b/src/gui/kernel/qshapedpixmapdndwindow.cpp
index 55a8aae33c..af60b36647 100644
--- a/src/gui/kernel/qshapedpixmapdndwindow.cpp
+++ b/src/gui/kernel/qshapedpixmapdndwindow.cpp
@@ -52,6 +52,12 @@ QShapedPixmapWindow::QShapedPixmapWindow()
     m_backingStore = new QBackingStore(this);
 }
 
+QShapedPixmapWindow::~QShapedPixmapWindow()
+{
+    delete m_backingStore;
+    m_backingStore = 0;
+}
+
 void QShapedPixmapWindow::render()
 {
     QRect rect(QPoint(), geometry().size());
diff --git a/src/gui/kernel/qshapedpixmapdndwindow_p.h b/src/gui/kernel/qshapedpixmapdndwindow_p.h
index b59305f055..04198c83cb 100644
--- a/src/gui/kernel/qshapedpixmapdndwindow_p.h
+++ b/src/gui/kernel/qshapedpixmapdndwindow_p.h
@@ -56,6 +56,7 @@ class QShapedPixmapWindow : public QWindow
     Q_OBJECT
 public:
     QShapedPixmapWindow();
+    ~QShapedPixmapWindow();
 
     void render();