diff --git a/shell_client.h b/shell_client.h
--- a/shell_client.h
+++ b/shell_client.h
@@ -22,6 +22,7 @@
 
 #include "abstract_client.h"
 #include <KWayland/Server/xdgshell_interface.h>
+#include <KWayland/Server/xdgforeign_interface.h>
 
 namespace KWayland
 {
@@ -125,6 +126,7 @@
     void installPlasmaShellSurface(KWayland::Server::PlasmaShellSurfaceInterface *surface);
     void installQtExtendedSurface(KWayland::Server::QtExtendedSurfaceInterface *surface);
     void installServerSideDecoration(KWayland::Server::ServerSideDecorationInterface *decoration);
+    void installXdgForeignUnstableInterface(KWayland::Server::XdgForeignUnstableInterface *foreign);
 
     bool isInitialPositionSet() const;
 
@@ -208,6 +210,7 @@
     QPointer<KWayland::Server::PlasmaShellSurfaceInterface> m_plasmaShellSurface;
     QPointer<KWayland::Server::QtExtendedSurfaceInterface> m_qtExtendedSurface;
     KWayland::Server::ServerSideDecorationInterface *m_serverDecoration = nullptr;
+    QPointer<KWayland::Server::XdgForeignUnstableInterface> m_XdgForeign = nullptr;
     bool m_userNoBorder = false;
     bool m_fullScreen = false;
     bool m_transient = false;
diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -1320,6 +1320,9 @@
     if (m_xdgShellPopup) {
         s = m_xdgShellPopup->transientFor().data();
     }
+    if (m_XdgForeign) {
+        s = m_XdgForeign->transientFor(surface());
+    }
     auto t = waylandServer()->findClient(s);
     if (t != transientFor()) {
         // remove from main client
@@ -1399,6 +1402,13 @@
     );
 }
 
+void ShellClient::installXdgForeignUnstableInterface(KWayland::Server::XdgForeignUnstableInterface *foreign)
+{
+    m_XdgForeign = foreign;
+    connect(m_XdgForeign, &KWayland::Server::XdgForeignUnstableInterface::transientChanged, this, &ShellClient::setTransient);
+    setTransient();
+}
+
 bool ShellClient::shouldExposeToWindowManagement()
 {
     if (isInternal()) {
diff --git a/wayland_server.h b/wayland_server.h
--- a/wayland_server.h
+++ b/wayland_server.h
@@ -56,6 +56,7 @@
 class OutputManagementInterface;
 class OutputConfigurationInterface;
 class XdgShellInterface;
+class XdgForeignUnstableInterface;
 }
 }
 
@@ -229,6 +230,7 @@
         KWayland::Server::ClientConnection *client = nullptr;
         QPointer<KWayland::Server::DataDeviceInterface> ddi;
     } m_xclipbaordSync;
+    KWayland::Server::XdgForeignUnstableInterface *m_XdgForeign = nullptr;
     QList<ShellClient*> m_clients;
     QList<ShellClient*> m_internalClients;
     QHash<KWayland::Server::ClientConnection*, quint16> m_clientIds;
diff --git a/wayland_server.cpp b/wayland_server.cpp
--- a/wayland_server.cpp
+++ b/wayland_server.cpp
@@ -158,6 +158,7 @@
     } else {
         connect(client, &ShellClient::windowShown, this, &WaylandServer::shellClientShown);
     }
+    client->installXdgForeignUnstableInterface(m_XdgForeign);
 }
 
 bool WaylandServer::init(const QByteArray &socketName, InitalizationFlags flags)
@@ -301,6 +302,9 @@
 
     m_display->createSubCompositor(m_display)->create();
 
+    m_XdgForeign = m_display->createXdgForeignUnstableInterface(m_display);
+    m_XdgForeign->create();
+
     return true;
 }