diff --git a/src/app/main.cpp b/src/app/main.cpp
index 6a2d518da06..d3946584e3c 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -289,6 +289,13 @@ static void setHighDpiEnvironmentVariable()
         QGuiApplication::setHighDpiScaleFactorRoundingPolicy(
             Qt::HighDpiScaleFactorRoundingPolicy::Round);
 #endif
+
+#endif
+    } else {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        /* AA_DisableHighDpiScaling is deprecated */
+        QGuiApplication::setHighDpiScaleFactorRoundingPolicy(
+            Qt::HighDpiScaleFactorRoundingPolicy::Floor);
 #endif
     }
 }