Index: /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpViewer.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpViewer.cpp	(revision 88473)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpViewer.cpp	(revision 88474)
@@ -642,5 +642,6 @@
         if (m_fOverlayMode)
         {
-            QSize size(0.8 * width(), 0.8 * height());
+            QSize size(qMin((int)(0.9 * width()), m_overlayPixmap.width()),
+                        qMin((int)(0.9 * height()), height()));
             m_pOverlayLabel->setPixmap(m_overlayPixmap.scaled(size,  Qt::KeepAspectRatio, Qt::SmoothTransformation));
             int x = 0.5 * (width() - m_pOverlayLabel->width());