diff --git a/effects/thumbnailaside.cpp b/effects/thumbnailaside.cpp
index 46cbdf538d..cbf8d7e3ee 100644
--- a/effects/thumbnailaside.cpp
+++ b/effects/thumbnailaside.cpp
@@ -145,7 +145,7 @@ void ThumbnailAsideEffect::arrange()
         mwidth = qMax( mwidth, d.window->width());
         pos[ d.index ] = d.window->height();
         }
-    QRect area = effects->clientArea( WorkArea, screen, effects->currentDesktop());
+    QRect area = effects->clientArea( MaximizeArea, screen, effects->currentDesktop());
     double scale = area.height() / double( height );
     scale = qMin( scale, maxwidth / double( mwidth )); // don't be wider than maxwidth pixels
     int add = 0;