diff --git a/src/gui/kernel/qhighdpiscaling.cpp b/src/gui/kernel/qhighdpiscaling.cpp
index 0f4803d92a..d0d2a5a119 100644
--- a/src/gui/kernel/qhighdpiscaling.cpp
+++ b/src/gui/kernel/qhighdpiscaling.cpp
@@ -494,7 +494,8 @@ void QHighDpiScaling::updateHighDpiScaling()
         qCDebug(lcHighDpi) << "Applying screen factors" << m_screenFactors;
         int i = -1;
         const auto screens = QGuiApplication::screens();
-        for (const auto &[name, factor] : m_screenFactors) {
+        for (const auto &[name, rawFactor]: m_screenFactors) {
+            const qreal factor = roundScaleFactor(rawFactor);
             ++i;
             if (name.isNull()) {
                 if (i < screens.size())
diff --git a/tests/auto/gui/kernel/qhighdpi/tst_qhighdpi.cpp b/tests/auto/gui/kernel/qhighdpi/tst_qhighdpi.cpp
index fad3df4daa..b062a88c1f 100644
--- a/tests/auto/gui/kernel/qhighdpi/tst_qhighdpi.cpp
+++ b/tests/auto/gui/kernel/qhighdpi/tst_qhighdpi.cpp
@@ -313,9 +313,10 @@ void tst_QHighDpi::environment_QT_SCREEN_SCALE_FACTORS()
     QFETCH(QByteArray, environment);
     QFETCH(QList<qreal>, expectedDprValues);
 
+    qputenv("QT_SCREEN_SCALE_FACTORS", environment);
+
     // Verify that setting QT_SCREEN_SCALE_FACTORS overrides the from-platform-screen-DPI DPR.
     {
-        qputenv("QT_SCREEN_SCALE_FACTORS", environment);
         std::unique_ptr<QGuiApplication> app(createStandardOffscreenApp(platformScreenDpi));
         int i = 0;
         for (QScreen *screen : app->screens()) {
@@ -327,6 +328,18 @@ void tst_QHighDpi::environment_QT_SCREEN_SCALE_FACTORS()
             QCOMPARE(window.devicePixelRatio(), expextedDpr);
         }
     }
+
+    // Verify that setHighDpiScaleFactorRoundingPolicy applies to QT_SCREEN_SCALE_FACTORS as well
+    QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::Round);
+    {
+        std::unique_ptr<QGuiApplication> app(createStandardOffscreenApp(platformScreenDpi));
+        int i = 0;
+        for (QScreen *screen : app->screens()) {
+            qreal expectedRounderDpr = qRound(expectedDprValues[i++]);
+            qreal windowDpr = QWindow(screen).devicePixelRatio();
+            QCOMPARE(windowDpr, expectedRounderDpr);
+        }
+    }
 }
 
 void tst_QHighDpi::environment_QT_USE_PHYSICAL_DPI()