diff --git a/effects/slideback/slideback.h b/effects/slideback/slideback.h
--- a/effects/slideback/slideback.h
+++ b/effects/slideback/slideback.h
@@ -66,6 +66,8 @@
     int m_tabboxActive;
     QList <QRegion> clippedRegions;
 
+    QMap <EffectWindow*, bool> m_windowForceBlurRoleState;
+
     QRect getSlideDestination(const QRect &windowUnderGeometry, const QRect &windowOverGeometry);
     bool isWindowUsable(EffectWindow *w);
     bool intersects(EffectWindow *windowUnder, const QRect &windowOverGeometry);
diff --git a/effects/slideback/slideback.cpp b/effects/slideback/slideback.cpp
--- a/effects/slideback/slideback.cpp
+++ b/effects/slideback/slideback.cpp
@@ -149,14 +149,25 @@
         motionManager.calculate(time);
         data.mask |= Effect::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
     }
+
+    for (auto const &w : effects->stackingOrder()) {
+        m_windowForceBlurRoleState[w] = w->data(WindowForceBlurRole).toBool();
+        w->setData(WindowForceBlurRole, QVariant(true));
+    }
+
     effects->prePaintScreen(data, time);
 }
 
 void SlideBackEffect::postPaintScreen()
 {
     if (motionManager.areWindowsMoving()) {
         effects->addRepaintFull();
     }
+
+    for (auto &w : effects->stackingOrder()) {
+        w->setData(WindowForceBlurRole, m_windowForceBlurRoleState.value(w, false));
+    }
+
     effects->postPaintScreen();
 }