diff --git a/src/gui/platform/unix/qgenericunixservices.cpp b/src/gui/platform/unix/qgenericunixservices.cpp
index 34d9c37e246..88968413563 100644
--- a/src/gui/platform/unix/qgenericunixservices.cpp
+++ b/src/gui/platform/unix/qgenericunixservices.cpp
@@ -554,9 +554,7 @@ QPlatformServiceColorPicker *QGenericUnixServices::colorPicker(QWindow *parent)
 
 QString QGenericUnixServices::portalWindowIdentifier(QWindow *window)
 {
-    if (QGuiApplication::platformName() == QLatin1String("xcb"))
-        return "x11:"_L1 + QString::number(window->winId(), 16);
-
+    Q_UNUSED(window);
     return QString();
 }
 
diff --git a/src/plugins/platforms/xcb/qxcbintegration.cpp b/src/plugins/platforms/xcb/qxcbintegration.cpp
index d25b059852e..8fe5d0b1cd4 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.cpp
+++ b/src/plugins/platforms/xcb/qxcbintegration.cpp
@@ -93,10 +93,17 @@ static bool runningUnderDebugger()
 #endif
 }
 
+class QXcbUnixServices : public QGenericUnixServices
+{
+public:
+    QString portalWindowIdentifier(QWindow *window) override;
+};
+
+
 QXcbIntegration *QXcbIntegration::m_instance = nullptr;
 
 QXcbIntegration::QXcbIntegration(const QStringList &parameters, int &argc, char **argv)
-    : m_services(new QGenericUnixServices)
+    : m_services(new QXcbUnixServices)
     , m_instanceName(nullptr)
     , m_canGrab(true)
     , m_defaultVisualId(UINT_MAX)
@@ -593,4 +600,9 @@ void QXcbIntegration::setApplicationBadge(qint64 number)
     unixServices->setApplicationBadge(number);
 }
 
+QString QXcbUnixServices::portalWindowIdentifier(QWindow *window)
+{
+    return "x11:"_L1 + QString::number(window->winId(), 16);
+}
+
 QT_END_NAMESPACE