diff --git a/effects/coverswitch.cpp b/effects/coverswitch.cpp
index 331ca67279..3177e449b4 100644
--- a/effects/coverswitch.cpp
+++ b/effects/coverswitch.cpp
@@ -686,7 +686,7 @@ void CoverSwitchEffect::paintWindowCover( EffectWindow* w, QRect windowRect, boo
     {
     WindowPaintData data( w );
 
-    data.opacity = opacity;
+    data.opacity *= opacity;
 
     QRect thumbnail = infiniteRegion();
     setPositionTransformations( data,
diff --git a/effects/flipswitch.cpp b/effects/flipswitch.cpp
index 04f0c2a1f4..beba7dbcd2 100644
--- a/effects/flipswitch.cpp
+++ b/effects/flipswitch.cpp
@@ -603,7 +603,7 @@ void FlipSwitchEffect::paintWindowFlip( EffectWindow* w, bool draw, float opacit
         QRect( x, y, w->geometry().width(), w->geometry().height() ),
         Qt::KeepAspectRatio );
 
-    data.opacity = opacity;
+    data.opacity *= opacity;
     thumbnail = infiniteRegion();
     // if paintWindow() is used the window behind the initial selected window is not painted on the stack,
     // but painted when it is selected