diff --git a/vcl/unx/kde5/KDE5FilePicker.cxx b/vcl/unx/kde5/KDE5FilePicker.cxx
index 5d9acdcd7a50..19bea46654a3 100644
--- a/vcl/unx/kde5/KDE5FilePicker.cxx
+++ b/vcl/unx/kde5/KDE5FilePicker.cxx
@@ -40,8 +40,6 @@ KDE5FilePicker::~KDE5FilePicker()
     delete _dialog;
 }
 
-void KDE5FilePicker::setWinId(sal_uIntPtr winId) { _winId = winId; }
-
 bool KDE5FilePicker::eventFilter(QObject* o, QEvent* e)
 {
     if (e->type() == QEvent::Show && o->isWidgetType())
@@ -49,7 +47,6 @@ bool KDE5FilePicker::eventFilter(QObject* o, QEvent* e)
         auto* w = static_cast<QWidget*>(o);
         if (!w->parentWidget() && w->isModal())
         {
-            KWindowSystem::setMainWindow(w, _winId);
             if (auto* fileWidget = w->findChild<KFileWidget*>({}, Qt::FindDirectChildrenOnly))
                 fileWidget->setCustomWidget(_extraControls);
         }
diff --git a/vcl/unx/kde5/KDE5FilePicker.hxx b/vcl/unx/kde5/KDE5FilePicker.hxx
index 4b45052827c4..69d86c5107a9 100644
--- a/vcl/unx/kde5/KDE5FilePicker.hxx
+++ b/vcl/unx/kde5/KDE5FilePicker.hxx
@@ -78,8 +78,6 @@ protected:
     //layout for extra custom controls
     QGridLayout* _layout;
 
-    sal_uIntPtr _winId;
-
     bool allowRemoteUrls;
 
 public:
@@ -140,8 +138,6 @@ public:
     // XFilePicker2 functions
     virtual css::uno::Sequence<OUString> SAL_CALL getSelectedFiles() override;
 
-    void setWinId(sal_uIntPtr winId);
-
     // XInitialization
     virtual void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArguments) override;
 
diff --git a/vcl/unx/kde5/KDE5FilePicker2.cxx b/vcl/unx/kde5/KDE5FilePicker2.cxx
index cebd2ee4f4f9..b7c3320344bf 100644
--- a/vcl/unx/kde5/KDE5FilePicker2.cxx
+++ b/vcl/unx/kde5/KDE5FilePicker2.cxx
@@ -82,7 +82,6 @@ KDE5FilePicker::KDE5FilePicker(QFileDialog::FileMode eMode)
     , _dialog(new QFileDialog(nullptr, {}, QDir::homePath()))
     , _extraControls(new QWidget)
     , _layout(new QGridLayout(_extraControls))
-    , _winId(0)
     , allowRemoteUrls(false)
 {
     _dialog->setSupportedSchemes({