diff --git a/src/plugins/platforms/windows/qwindowsapplication.cpp b/src/plugins/platforms/windows/qwindowsapplication.cpp
index f823a69552d..00477e2890b 100644
--- a/src/plugins/platforms/windows/qwindowsapplication.cpp
+++ b/src/plugins/platforms/windows/qwindowsapplication.cpp
@@ -9,17 +9,13 @@
 #include "qwindowsopengltester.h"
 #include "qwindowswindow.h"
 #include "qwindowsintegration.h"
+#include "qwindowstheme.h"
 
 #include <QtCore/qvariant.h>
 #include <QtCore/private/qfunctions_win_p.h>
 
 #include <QtGui/qpalette.h>
 
-#if QT_CONFIG(cpp_winrt)
-#   include <QtCore/private/qt_winrtbase_p.h>
-#   include <winrt/Windows.UI.ViewManagement.h>
-#endif // QT_CONFIG(cpp_winrt)
-
 QT_BEGIN_NAMESPACE
 
 void QWindowsApplication::setTouchWindowTouchType(QWindowsApplication::TouchWindowTouchTypes type)
@@ -147,67 +143,9 @@ QVariant QWindowsApplication::gpuList() const
     return result;
 }
 
-static inline QColor getSysColor(int index)
-{
-    COLORREF cr = GetSysColor(index);
-    return QColor(GetRValue(cr), GetGValue(cr), GetBValue(cr));
-}
-
-#if QT_CONFIG(cpp_winrt)
-static constexpr QColor getSysColor(winrt::Windows::UI::Color &&color)
-{
-    return QColor(color.R, color.G, color.B, color.A);
-}
-#endif
-
-static inline QColor placeHolderColor(QColor textColor)
-{
-    textColor.setAlpha(128);
-    return textColor;
-}
-
 void QWindowsApplication::lightSystemPalette(QPalette &result) const
 {
-    QColor background = getSysColor(COLOR_BTNFACE);
-    QColor textColor = getSysColor(COLOR_WINDOWTEXT);
-    QColor accent = getSysColor(COLOR_HIGHLIGHT);
-
-#if QT_CONFIG(cpp_winrt)
-    // respect the Windows 11 accent color
-    using namespace winrt::Windows::UI::ViewManagement;
-    const auto settings = UISettings();
-
-    accent = getSysColor(settings.GetColorValue(UIColorType::Accent));
-#endif
-
-    const QColor btnFace = background;
-    const QColor btnHighlight = getSysColor(COLOR_BTNHIGHLIGHT);
-
-    result.setColor(QPalette::Highlight, accent);
-    result.setColor(QPalette::WindowText, getSysColor(COLOR_WINDOWTEXT));
-    result.setColor(QPalette::Button, btnFace);
-    result.setColor(QPalette::Light, btnHighlight);
-    result.setColor(QPalette::Dark, getSysColor(COLOR_BTNSHADOW));
-    result.setColor(QPalette::Mid, result.button().color().darker(150));
-    result.setColor(QPalette::Text, textColor);
-    result.setColor(QPalette::PlaceholderText, placeHolderColor(textColor));
-    result.setColor(QPalette::BrightText, btnHighlight);
-    result.setColor(QPalette::Base, getSysColor(COLOR_WINDOW));
-    result.setColor(QPalette::Window, btnFace);
-    result.setColor(QPalette::ButtonText, getSysColor(COLOR_BTNTEXT));
-    result.setColor(QPalette::Midlight, getSysColor(COLOR_3DLIGHT));
-    result.setColor(QPalette::Shadow, getSysColor(COLOR_3DDKSHADOW));
-    result.setColor(QPalette::HighlightedText, getSysColor(COLOR_HIGHLIGHTTEXT));
-
-    result.setColor(QPalette::Link, Qt::blue);
-    result.setColor(QPalette::LinkVisited, Qt::magenta);
-    result.setColor(QPalette::Inactive, QPalette::Button, result.button().color());
-    result.setColor(QPalette::Inactive, QPalette::Window, result.window().color());
-    result.setColor(QPalette::Inactive, QPalette::Light, result.light().color());
-    result.setColor(QPalette::Inactive, QPalette::Dark, result.dark().color());
-
-    if (result.midlight() == result.button())
-        result.setColor(QPalette::Midlight, result.button().color().lighter(110));
+    QWindowsTheme::populateLightSystemBasePalette(result);
 }
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowstheme.cpp b/src/plugins/platforms/windows/qwindowstheme.cpp
index 29c4c47c36e..6fba9e55c13 100644
--- a/src/plugins/platforms/windows/qwindowstheme.cpp
+++ b/src/plugins/platforms/windows/qwindowstheme.cpp
@@ -225,11 +225,48 @@ static QColor placeHolderColor(QColor textColor)
     This is used when the theme is light mode, and when the theme is dark but the
     application doesn't support dark mode. In the latter case, we need to check.
 */
-static void populateLightSystemBasePalette(QPalette &result)
+void QWindowsTheme::populateLightSystemBasePalette(QPalette &result)
 {
-    using QWindowsApplication = QNativeInterface::Private::QWindowsApplication;
-    if (auto nativeWindowsApp = dynamic_cast<QWindowsApplication *>(QGuiApplicationPrivate::platformIntegration()))
-        nativeWindowsApp->lightSystemPalette(result);
+    QColor background = getSysColor(COLOR_BTNFACE);
+    QColor textColor = getSysColor(COLOR_WINDOWTEXT);
+    QColor accent = getSysColor(COLOR_HIGHLIGHT);
+
+#if QT_CONFIG(cpp_winrt)
+    // respect the Windows 11 accent color
+    using namespace winrt::Windows::UI::ViewManagement;
+    const auto settings = UISettings();
+
+    accent = getSysColor(settings.GetColorValue(UIColorType::Accent));
+#endif
+
+    const QColor btnFace = background;
+    const QColor btnHighlight = getSysColor(COLOR_BTNHIGHLIGHT);
+
+    result.setColor(QPalette::Highlight, accent);
+    result.setColor(QPalette::WindowText, getSysColor(COLOR_WINDOWTEXT));
+    result.setColor(QPalette::Button, btnFace);
+    result.setColor(QPalette::Light, btnHighlight);
+    result.setColor(QPalette::Dark, getSysColor(COLOR_BTNSHADOW));
+    result.setColor(QPalette::Mid, result.button().color().darker(150));
+    result.setColor(QPalette::Text, textColor);
+    result.setColor(QPalette::PlaceholderText, placeHolderColor(textColor));
+    result.setColor(QPalette::BrightText, btnHighlight);
+    result.setColor(QPalette::Base, getSysColor(COLOR_WINDOW));
+    result.setColor(QPalette::Window, btnFace);
+    result.setColor(QPalette::ButtonText, getSysColor(COLOR_BTNTEXT));
+    result.setColor(QPalette::Midlight, getSysColor(COLOR_3DLIGHT));
+    result.setColor(QPalette::Shadow, getSysColor(COLOR_3DDKSHADOW));
+    result.setColor(QPalette::HighlightedText, getSysColor(COLOR_HIGHLIGHTTEXT));
+
+    result.setColor(QPalette::Link, Qt::blue);
+    result.setColor(QPalette::LinkVisited, Qt::magenta);
+    result.setColor(QPalette::Inactive, QPalette::Button, result.button().color());
+    result.setColor(QPalette::Inactive, QPalette::Window, result.window().color());
+    result.setColor(QPalette::Inactive, QPalette::Light, result.light().color());
+    result.setColor(QPalette::Inactive, QPalette::Dark, result.dark().color());
+
+    if (result.midlight() == result.button())
+        result.setColor(QPalette::Midlight, result.button().color().lighter(110));
 }
 
 static void populateDarkSystemBasePalette(QPalette &result)
@@ -300,7 +337,7 @@ static QPalette systemPalette(bool light)
 {
     QPalette result = standardPalette();
     if (light)
-        populateLightSystemBasePalette(result);
+        QWindowsTheme::populateLightSystemBasePalette(result);
     else
         populateDarkSystemBasePalette(result);
 
diff --git a/src/plugins/platforms/windows/qwindowstheme.h b/src/plugins/platforms/windows/qwindowstheme.h
index 18b87e40727..7f320da9675 100644
--- a/src/plugins/platforms/windows/qwindowstheme.h
+++ b/src/plugins/platforms/windows/qwindowstheme.h
@@ -61,6 +61,8 @@ public:
 
     static const char *name;
 
+    static void populateLightSystemBasePalette(QPalette &result);
+
 private:
     void clearPalettes();
     void refreshPalettes();