diff --git a/effects/dimscreen/dimscreen.cpp b/effects/dimscreen/dimscreen.cpp
index 3b6147c1b..a7f4f7e4d 100644
--- a/effects/dimscreen/dimscreen.cpp
+++ b/effects/dimscreen/dimscreen.cpp
@@ -1,115 +1,119 @@
 /********************************************************************
  KWin - the KDE window manager
  This file is part of the KDE project.
 
  Copyright (C) 2008, 2009 Martin Gräßlin <mgraesslin@kde.org>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #include "dimscreen.h"
 
 #include <kwinglutils.h>
 
+#include <QSet>
+
 namespace KWin
 {
 
+static const QSet<QString> s_authWindows {
+    QStringLiteral("kdesu kdesu"),
+    QStringLiteral("kdesudo kdesudo"),
+    QStringLiteral("pinentry pinentry"),
+    QStringLiteral("polkit-kde-authentication-agent-1 polkit-kde-authentication-agent-1"),
+    QStringLiteral("polkit-kde-manager polkit-kde-manager"),
+};
+
 DimScreenEffect::DimScreenEffect()
     : mActivated(false)
     , activateAnimation(false)
     , deactivateAnimation(false)
 {
     reconfigure(ReconfigureAll);
     connect(effects, SIGNAL(windowActivated(KWin::EffectWindow*)), this, SLOT(slotWindowActivated(KWin::EffectWindow*)));
 }
 
 DimScreenEffect::~DimScreenEffect()
 {
 }
 
 void DimScreenEffect::reconfigure(ReconfigureFlags)
 {
     timeline.setDuration(animationTime(250));
 }
 
 void DimScreenEffect::prePaintScreen(ScreenPrePaintData& data, int time)
 {
     if (mActivated && activateAnimation && !effects->activeFullScreenEffect())
         timeline.setCurrentTime(timeline.currentTime() + time);
     if (mActivated && deactivateAnimation)
         timeline.setCurrentTime(timeline.currentTime() - time);
     if (mActivated && effects->activeFullScreenEffect())
         timeline.setCurrentTime(timeline.currentTime() - time);
     if (mActivated && !activateAnimation && !deactivateAnimation && !effects->activeFullScreenEffect() && timeline.currentValue() != 1.0)
         timeline.setCurrentTime(timeline.currentTime() + time);
     effects->prePaintScreen(data, time);
 }
 
 void DimScreenEffect::postPaintScreen()
 {
     if (mActivated) {
         if (activateAnimation && timeline.currentValue() == 1.0) {
             activateAnimation = false;
             effects->addRepaintFull();
         }
         if (deactivateAnimation && timeline.currentValue() == 0.0) {
             deactivateAnimation = false;
             mActivated = false;
             effects->addRepaintFull();
         }
         // still animating
         if (timeline.currentValue() > 0.0 && timeline.currentValue() < 1.0)
             effects->addRepaintFull();
     }
     effects->postPaintScreen();
 }
 
 void DimScreenEffect::paintWindow(EffectWindow *w, int mask, QRegion region, WindowPaintData &data)
 {
     if (mActivated && (w != window) && w->isManaged()) {
         data.multiplyBrightness((1.0 - 0.33 * timeline.currentValue()));
         data.multiplySaturation((1.0 - 0.33 * timeline.currentValue()));
     }
     effects->paintWindow(w, mask, region, data);
 }
 
 void DimScreenEffect::slotWindowActivated(EffectWindow *w)
 {
     if (!w) return;
-    QStringList check;
-    check << QStringLiteral("kdesu kdesu");
-    check << QStringLiteral("kdesudo kdesudo");
-    check << QStringLiteral("polkit-kde-manager polkit-kde-manager");
-    check << QStringLiteral("polkit-kde-authentication-agent-1 polkit-kde-authentication-agent-1");
-    check << QStringLiteral("pinentry pinentry");
-    if (check.contains(w->windowClass())) {
+    if (s_authWindows.contains(w->windowClass())) {
         mActivated = true;
         activateAnimation = true;
         deactivateAnimation = false;
         window = w;
         effects->addRepaintFull();
     } else {
         if (mActivated) {
             activateAnimation = false;
             deactivateAnimation = true;
             effects->addRepaintFull();
         }
     }
 }
 
 bool DimScreenEffect::isActive() const
 {
     return mActivated;
 }
 
 } // namespace