diff --git a/src/sddmkcm.cpp b/src/sddmkcm.cpp
index 5b69dbb..4f393cc 100644
--- a/src/sddmkcm.cpp
+++ b/src/sddmkcm.cpp
@@ -1,129 +1,131 @@
 /*
     Copyright 2013 by Reza Fatahilah Shah <rshah0385@kireihana.com>
  
     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 "sddmkcm.h"
 
 #include <algorithm>
 
 #include <QDir>
 #include <QHBoxLayout>
 #include <QTabWidget>
 
 #include <KPluginFactory>
 
 #include <KAuth/KAuthActionReply>
 
 #include <KAboutData>
 
 #include <KLocalizedString>
 #include <QDebug>
 
 #include "config.h"
 #include "themeconfig.h"
 #include "advanceconfig.h"
 
 #include <kpluginfactory.h>
 #include <kpluginloader.h>
 #include <kauthexecutejob.h>
 
 K_PLUGIN_FACTORY(SddmKcmFactory, registerPlugin<SddmKcm>();)
 
 
 SddmKcm::SddmKcm(QWidget *parent, const QVariantList &args) :
     KCModule(parent, args)
 {
     KAboutData* aboutData = new KAboutData(QStringLiteral("kcmsddm"), i18n("SDDM KDE Config"), QString::fromLatin1(PROJECT_VERSION));
 
     aboutData->setShortDescription(i18n("Login screen using the SDDM"));
     aboutData->setLicense(KAboutLicense::GPL_V2);
     aboutData->setHomepage(QStringLiteral("https://projects.kde.org/projects/kde/workspace/sddm-kcm"));
 
     aboutData->addAuthor(QStringLiteral("Reza Fatahilah Shah"), i18n("Author"), QStringLiteral("rshah0385@kireihana.com"));
     aboutData->addAuthor(QStringLiteral("David Edmundson"), i18n("Author"), QStringLiteral("davidedmundson@kde.org"));
 
     setAboutData(aboutData);
     setNeedsAuthorization(true);
 
     mSddmConfig = KSharedConfig::openConfig(QString::fromLatin1(SDDM_CONFIG_FILE), KConfig::CascadeConfig);
 
     // This does not listen for new config files in the directory.
     QStringList configFiles = QDir(QString::fromLatin1(SDDM_CONFIG_DIR)).entryList(QDir::Files | QDir::NoDotAndDotDot, QDir::LocaleAware),
                 systemConfigFiles = QDir(QString::fromLatin1(SDDM_SYSTEM_CONFIG_DIR)).entryList(QDir::Files | QDir::NoDotAndDotDot, QDir::LocaleAware);
+
+    // QStringBuilder keeps dangling references, so force return of QString (QTBUG-47066)
     std::transform(systemConfigFiles.begin(), systemConfigFiles.end(), systemConfigFiles.begin(),
-                    [](const QString &filename) { return QStringLiteral(SDDM_SYSTEM_CONFIG_DIR "/") + filename; });
+                    [](const QString &filename) -> QString { return QStringLiteral(SDDM_SYSTEM_CONFIG_DIR "/") + filename; });
     std::transform(configFiles.begin(), configFiles.end(), configFiles.begin(),
-                    [](const QString &filename) { return QStringLiteral(SDDM_CONFIG_DIR "/") + filename; });
+                    [](const QString &filename) -> QString { return QStringLiteral(SDDM_CONFIG_DIR "/") + filename; });
 
     mSddmConfig->addConfigSources(systemConfigFiles + configFiles);
 
     prepareUi();
 }
 
 SddmKcm::~SddmKcm()
 {
 }
 
 void SddmKcm::save()
 {
     QVariantMap args;
     
     args[QStringLiteral("sddm.conf")] = QString::fromLatin1(SDDM_CONFIG_FILE);
 
     if (!mThemeConfig->themeConfigPath().isEmpty()) {
         args[QStringLiteral("theme.conf.user")] = QString(mThemeConfig->themeConfigPath() + QLatin1String(".user"));
     }
 
     qDebug() << "Ovr:" << args[QStringLiteral("theme.conf.user")].toString();
     args.unite(mThemeConfig->save());
     args.unite(mAdvanceConfig->save());
 
     KAuth::Action saveAction = authAction();
 
     saveAction.setHelperId(QStringLiteral("org.kde.kcontrol.kcmsddm"));
     saveAction.setArguments(args);
     
     auto job = saveAction.execute();
     job->exec();
 
     if (job->error()){
         qDebug() << "Save Failed";
         qDebug() << job->errorString();
         qDebug() << job->errorText();
     } else {
         changed(false);
         qDebug() << "Option saved";
     }
     
 }
 
 void SddmKcm::prepareUi()
 {
     QHBoxLayout* layout = new QHBoxLayout(this);
     QTabWidget* tabHolder = new QTabWidget(this);
     layout->addWidget(tabHolder);
     
     mThemeConfig = new ThemeConfig(mSddmConfig, this);
     connect(mThemeConfig, SIGNAL(changed(bool)), SIGNAL(changed(bool)));
     
     tabHolder->addTab(mThemeConfig, i18n("Theme"));
     
     mAdvanceConfig = new AdvanceConfig(mSddmConfig, this);
     connect(mAdvanceConfig, SIGNAL(changed(bool)), SIGNAL(changed(bool)));
     
     tabHolder->addTab(mAdvanceConfig, i18n("Advanced"));
 }
 
 #include "sddmkcm.moc"