diff --git a/src/plugins/platforms/offscreen/qoffscreencommon.h b/src/plugins/platforms/offscreen/qoffscreencommon.h
index d0edfcc48b..6ed6f43816 100644
--- a/src/plugins/platforms/offscreen/qoffscreencommon.h
+++ b/src/plugins/platforms/offscreen/qoffscreencommon.h
@@ -106,6 +106,7 @@ public:
     bool scroll(const QRegion &area, int dx, int dy) override;
 
     QPixmap grabWindow(WId window, const QRect &rect) const;
+    QImage toImage() const override { return m_image; }
 
     static QOffscreenBackingStore *backingStoreForWinId(WId id);