diff --git a/src/wayland/xdgdecoration_v1_interface.cpp b/src/wayland/xdgdecoration_v1_interface.cpp
index e07258b7a3..b28737ce49 100644
--- a/src/wayland/xdgdecoration_v1_interface.cpp
+++ b/src/wayland/xdgdecoration_v1_interface.cpp
@@ -128,6 +128,7 @@ void XdgToplevelDecorationV1Interface::sendConfigure(Mode mode)
     case Mode::Client:
         d->send_configure(QtWaylandServer::zxdg_toplevel_decoration_v1::mode_client_side);
         break;
+    case Mode::None: // Faked as server_side mode.
     case Mode::Server:
         d->send_configure(QtWaylandServer::zxdg_toplevel_decoration_v1::mode_server_side);
         break;
diff --git a/src/wayland/xdgdecoration_v1_interface.h b/src/wayland/xdgdecoration_v1_interface.h
index 55a07ee74c..0f87994da2 100644
--- a/src/wayland/xdgdecoration_v1_interface.h
+++ b/src/wayland/xdgdecoration_v1_interface.h
@@ -61,7 +61,7 @@ class KWAYLANDSERVER_EXPORT XdgToplevelDecorationV1Interface : public QObject
     Q_OBJECT
 
 public:
-    enum class Mode { Undefined, Client, Server };
+    enum class Mode { Undefined, None, Client, Server };
     Q_ENUM(Mode)
 
     /**