diff --git a/src/helpers/killer/killer.cpp b/src/helpers/killer/killer.cpp
index 0a545b2c1a..eea3c9cec9 100644
--- a/src/helpers/killer/killer.cpp
+++ b/src/helpers/killer/killer.cpp
@@ -20,7 +20,7 @@
 
 int main(int argc, char *argv[])
 {
-    KLocalizedString::setApplicationDomain("kwin");
+    KLocalizedString::setApplicationDomain(QByteArrayLiteral("kwin"));
     qputenv("QT_QPA_PLATFORM", QByteArrayLiteral("xcb"));
     QApplication app(argc, argv);
     QApplication::setWindowIcon(QIcon::fromTheme(QStringLiteral("dialog-warning")));
diff --git a/src/kcms/decoration/kwin-applywindowdecoration.cpp b/src/kcms/decoration/kwin-applywindowdecoration.cpp
index 3f5ca76c87..89fcbd0d02 100644
--- a/src/kcms/decoration/kwin-applywindowdecoration.cpp
+++ b/src/kcms/decoration/kwin-applywindowdecoration.cpp
@@ -25,7 +25,7 @@ int main(int argc, char **argv)
     QCoreApplication::setApplicationName(QStringLiteral("kwin-applywindowdecoration"));
     QCoreApplication::setApplicationVersion(QStringLiteral("1.0"));
     QCoreApplication::setOrganizationDomain(QStringLiteral("kde.org"));
-    KLocalizedString::setApplicationDomain("kwin-applywindowdecoration");
+    KLocalizedString::setApplicationDomain(QByteArrayLiteral("kwin-applywindowdecoration"));
 
     QCommandLineParser *parser = new QCommandLineParser;
     parser->addHelpOption();
diff --git a/src/main.cpp b/src/main.cpp
index dd636c59eb..b287608c39 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -233,7 +233,7 @@ void Application::setupMalloc()
 
 void Application::setupLocalizedString()
 {
-    KLocalizedString::setApplicationDomain("kwin");
+    KLocalizedString::setApplicationDomain(QByteArrayLiteral("kwin"));
 }
 
 void Application::createWorkspace()