diff --git a/src/main.cpp b/src/main.cpp
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -32,6 +32,7 @@
 #include <KLocalizedString>
 #include <Kdelibs4ConfigMigrator>
 #include <KConfigGui>
+#include <KIO/PreviewJob>
 
 #include <QApplication>
 #include <QCommandLineParser>
@@ -66,6 +67,8 @@
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
 
+    KIO::PreviewJob::setDefaultDevicePixelRatio(qApp->devicePixelRatio());
+
     QApplication app(argc, argv);
     app.setWindowIcon(QIcon::fromTheme(QStringLiteral("system-file-manager"), app.windowIcon()));