diff --git a/kcmkwin/kwintabbox/thumbnailitem.cpp b/kcmkwin/kwintabbox/thumbnailitem.cpp
index fffe6c4a2d..e96b3473a3 100644
--- a/kcmkwin/kwintabbox/thumbnailitem.cpp
+++ b/kcmkwin/kwintabbox/thumbnailitem.cpp
@@ -29,6 +29,7 @@ WindowThumbnailItem::WindowThumbnailItem(QQuickPaintedItem* parent)
     : QQuickPaintedItem(parent)
     , m_wId(0)
     , m_image()
+    , m_clipToItem(nullptr)
 {
 }
 
@@ -43,6 +44,15 @@ void WindowThumbnailItem::setWId(qulonglong wId)
     findImage();
 }
 
+void WindowThumbnailItem::setClipTo(QQuickItem *clip)
+{
+    if (m_clipToItem == clip) {
+        return;
+    }
+    m_clipToItem = clip;
+    emit clipToChanged();
+}
+
 void WindowThumbnailItem::findImage()
 {
     QString imagePath;
diff --git a/kcmkwin/kwintabbox/thumbnailitem.h b/kcmkwin/kwintabbox/thumbnailitem.h
index 6b4bca4002..f5d339ca78 100644
--- a/kcmkwin/kwintabbox/thumbnailitem.h
+++ b/kcmkwin/kwintabbox/thumbnailitem.h
@@ -31,6 +31,7 @@ class WindowThumbnailItem : public QQuickPaintedItem
 {
     Q_OBJECT
     Q_PROPERTY(qulonglong wId READ wId WRITE setWId NOTIFY wIdChanged SCRIPTABLE true)
+    Q_PROPERTY(QQuickItem *clipTo READ clipTo WRITE setClipTo NOTIFY clipToChanged)
 public:
     explicit WindowThumbnailItem(QQuickPaintedItem *parent = 0);
     virtual ~WindowThumbnailItem();
@@ -38,7 +39,11 @@ public:
     qulonglong wId() const {
         return m_wId;
     }
+    QQuickItem *clipTo() const {
+        return m_clipToItem;
+    }
     void setWId(qulonglong wId);
+    void setClipTo(QQuickItem *clip);
     virtual void paint(QPainter *painter) override;
 
     enum Thumbnail {
@@ -49,10 +54,12 @@ public:
     };
 Q_SIGNALS:
     void wIdChanged(qulonglong wid);
+    void clipToChanged();
 private:
     void findImage();
     qulonglong m_wId;
     QImage m_image;
+    QQuickItem *m_clipToItem;
 };
 
 } // KWin