diff --git a/plugins/qpa/nativeinterface.cpp b/plugins/qpa/nativeinterface.cpp
index c3cb17599..fc7ab3b29 100644
--- a/plugins/qpa/nativeinterface.cpp
+++ b/plugins/qpa/nativeinterface.cpp
@@ -1,83 +1,104 @@
 /********************************************************************
  KWin - the KDE window manager
  This file is part of the KDE project.
 
 Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #include "nativeinterface.h"
 #include "integration.h"
 #include "window.h"
 #include "../../wayland_server.h"
 
 #include <QWindow>
 
 #include <KWayland/Client/connection_thread.h>
 #include <KWayland/Client/compositor.h>
 #include <KWayland/Client/surface.h>
 
 namespace KWin
 {
 namespace QPA
 {
 
 static const QByteArray s_displayKey = QByteArrayLiteral("display");
 static const QByteArray s_wlDisplayKey = QByteArrayLiteral("wl_display");
 static const QByteArray s_compositorKey = QByteArrayLiteral("compositor");
 static const QByteArray s_surfaceKey = QByteArrayLiteral("surface");
 
 NativeInterface::NativeInterface(Integration *integration)
     : QPlatformNativeInterface()
     , m_integration(integration)
 {
 }
 
 void *NativeInterface::nativeResourceForIntegration(const QByteArray &resource)
 {
     const QByteArray r = resource.toLower();
     if (r == s_displayKey || r == s_wlDisplayKey) {
         if (!waylandServer() || !waylandServer()->internalClientConection()) {
             return nullptr;
         }
         return waylandServer()->internalClientConection()->display();
     }
     if (r == s_compositorKey) {
         return static_cast<wl_compositor*>(*m_integration->compositor());
     }
     return nullptr;
 }
 
 void *NativeInterface::nativeResourceForWindow(const QByteArray &resource, QWindow *window)
 {
     const QByteArray r = resource.toLower();
     if (r == s_displayKey || r == s_wlDisplayKey) {
         if (!waylandServer() || !waylandServer()->internalClientConection()) {
             return nullptr;
         }
         return waylandServer()->internalClientConection()->display();
     }
     if (r == s_compositorKey) {
         return static_cast<wl_compositor*>(*m_integration->compositor());
     }
     if (r == s_surfaceKey && window) {
         if (auto handle = window->handle()) {
             return static_cast<wl_surface*>(*static_cast<Window*>(handle)->surface());
         }
     }
     return nullptr;
 }
 
+static void roundtrip()
+{
+    if (!waylandServer()) {
+        return;
+    }
+    auto c = waylandServer()->internalClientConection();
+    if (!c) {
+        return;
+    }
+    c->flush();
+    waylandServer()->dispatch();
+}
+
+QFunctionPointer NativeInterface::platformFunction(const QByteArray &function) const
+{
+    if (qstrcmp(function.toLower(), "roundtrip") == 0) {
+        return &roundtrip;
+    }
+    return nullptr;
+}
+
 }
 }
diff --git a/plugins/qpa/nativeinterface.h b/plugins/qpa/nativeinterface.h
index b36ee1bb3..4a9f8e398 100644
--- a/plugins/qpa/nativeinterface.h
+++ b/plugins/qpa/nativeinterface.h
@@ -1,46 +1,47 @@
 /********************************************************************
  KWin - the KDE window manager
  This file is part of the KDE project.
 
 Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #ifndef KWIN_QPA_NATIVEINTERFACE_H
 #define KWIN_QPA_NATIVEINTERFACE_H
 
 #include <qpa/qplatformnativeinterface.h>
 
 namespace KWin
 {
 namespace QPA
 {
 
 class Integration;
 
 class NativeInterface : public QPlatformNativeInterface
 {
 public:
     explicit NativeInterface(Integration *integration);
     void *nativeResourceForIntegration(const QByteArray &resource) override;
     void *nativeResourceForWindow(const QByteArray &resourceString, QWindow *window) override;
+    QFunctionPointer platformFunction(const QByteArray &function) const override;
 
 private:
     Integration *m_integration;
 };
 
 }
 }
 
 #endif