diff --git a/vcl/inc/unx/gtk/gtkinst.hxx b/vcl/inc/unx/gtk/gtkinst.hxx
index a597e5be2436..6446122611e5 100644
--- a/vcl/inc/unx/gtk/gtkinst.hxx
+++ b/vcl/inc/unx/gtk/gtkinst.hxx
@@ -33,6 +33,7 @@
 #include <com/sun/star/lang/XInitialization.hpp>
 #include <com/sun/star/lang/XServiceInfo.hpp>
 #include <com/sun/star/awt/XWindow.hpp>
+#include <comphelper/servicehelper.hxx>
 #include <cppuhelper/compbase.hxx>
 #include <vcl/weld.hxx>
 #include <vcl/weldutils.hxx>
@@ -343,6 +344,12 @@ public:
     {
         return m_pWeldWidget;
     }
+
+    sal_Int64 SAL_CALL getSomething(css::uno::Sequence<sal_Int8> const& aIdentifier) override
+    {
+        return comphelper::getSomethingImpl(
+            aIdentifier, this, comphelper::FallbackToGetSomethingOf<TransportAsXWindow>{});
+    }
 };
 
 GdkPixbuf* load_icon_by_name(const OUString& rIconName);
diff --git a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
index 4068d57f2fa1..762f1338fe62 100644
--- a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
+++ b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
@@ -34,6 +34,7 @@
 #include <com/sun/star/ui/dialogs/ExecutableDialogResults.hpp>
 #include <com/sun/star/ui/dialogs/CommonFilePickerElementIds.hpp>
 #include <com/sun/star/ui/dialogs/ExtendedFilePickerElementIds.hpp>
+#include <comphelper/servicehelper.hxx>
 #include <osl/diagnose.h>
 #include <rtl/process.h>
 #include <sal/log.hxx>
@@ -1631,7 +1632,7 @@ GtkWidget* SalGtkPicker::GetParentWidget(const uno::Sequence<uno::Any>& rArgumen
 
     if (xParentWindow.is())
     {
-        if (SalGtkXWindow* pGtkXWindow = dynamic_cast<SalGtkXWindow*>(xParentWindow.get()))
+        if (SalGtkXWindow* pGtkXWindow = comphelper::getFromUnoTunnel<SalGtkXWindow>(xParentWindow))
             pParentWidget = pGtkXWindow->getGtkWidget();
         else
         {
diff --git a/vcl/unx/gtk3/gtkinst.cxx b/vcl/unx/gtk3/gtkinst.cxx
index 0525f8118531..960aabe11a0b 100644
--- a/vcl/unx/gtk3/gtkinst.cxx
+++ b/vcl/unx/gtk3/gtkinst.cxx
@@ -65,6 +65,7 @@
 #include <comphelper/processfactory.hxx>
 #include <comphelper/propertyvalue.hxx>
 #include <comphelper/sequence.hxx>
+#include <comphelper/servicehelper.hxx>
 #include <comphelper/string.hxx>
 #include <cppuhelper/compbase.hxx>
 #include <cppuhelper/implbase.hxx>
@@ -24483,7 +24484,7 @@ weld::MessageDialog* GtkInstance::CreateMessageDialog(weld::Widget* pParent, Vcl
 
 weld::Window* GtkInstance::GetFrameWeld(const css::uno::Reference<css::awt::XWindow>& rWindow)
 {
-    if (SalGtkXWindow* pGtkXWindow = dynamic_cast<SalGtkXWindow*>(rWindow.get()))
+    if (SalGtkXWindow* pGtkXWindow = comphelper::getFromUnoTunnel<SalGtkXWindow>(rWindow))
         return pGtkXWindow->getFrameWeld();
     return SalInstance::GetFrameWeld(rWindow);
 }