diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index e1c1e99a5a..3e2cb79def 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -541,7 +541,7 @@ QString QWindowsContext::registerWindowClass(const QWindow *w)
     if (icon)
         cname += "Icon"_L1;
 
-    return registerWindowClass(cname, qWindowsWndProc, style, GetSysColorBrush(COLOR_WINDOW), icon);
+    return registerWindowClass(cname, qWindowsWndProc, style, nullptr, icon);
 }
 
 QString QWindowsContext::registerWindowClass(QString cname,
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 325e240889..b2e41dca24 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -2303,9 +2303,10 @@ bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
                                    WPARAM wParam, LPARAM, LRESULT *result)
 {
     if (message == WM_ERASEBKGND) { // Backing store - ignored.
-        if (!m_firstBgDraw && QWindowsIntegration::instance()->darkModeHandling().testFlag(QWindowsApplication::DarkModeStyle)) {
-            // Get system background color
-            const QColor bgColor = QGuiApplicationPrivate::platformTheme()->palette()->color(QPalette::Window);
+        if (!m_firstBgDraw) {
+            // Get window background from the default palette; this will
+            // usually be the system background color.
+            const QColor bgColor = QGuiApplication::palette().color(QPalette::Window);
             HBRUSH bgBrush = CreateSolidBrush(RGB(bgColor.red(), bgColor.green(), bgColor.blue()));
             // Fill rectangle with system background color
             RECT rc;