diff --git a/main_x11.cpp b/main_x11.cpp
index 2c137431b5..b2139e52e3 100644
--- a/main_x11.cpp
+++ b/main_x11.cpp
@@ -269,6 +269,9 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
     setenv("QT_QPA_PLATFORM", "xcb", true);
 
     qunsetenv("QT_DEVICE_PIXEL_RATIO");
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
+    QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
+#endif
 
     KWin::ApplicationX11 a(argc, argv);
     a.setupTranslator();