--- a/widget/gtk/mozwayland/mozwayland.c
+++ b/widget/gtk/mozwayland/mozwayland.c
@@ -1,17 +1,19 @@
 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim:expandtab:shiftwidth=4:tabstop=4:
  */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include <stdlib.h>
 #include "mozilla/Types.h"
 #include <gtk/gtk.h>
+#include <gtk/gtkx.h>
 #include <gdk/gdkwayland.h>
 
 union wl_argument;
 
 /* Those strucures are just placeholders and will be replaced by
  * real symbols from libwayland during run-time linking. We need to make
  * them explicitly visible.
  */
@@ -295,8 +297,18 @@ wl_egl_window_destroy(struct wl_egl_wind
 }
 
 MOZ_EXPORT void
 wl_egl_window_resize(struct wl_egl_window *egl_window,
                      int width, int height,
                      int dx, int dy)
 {
 }
+
+MOZ_EXPORT GType
+gdk_wayland_display_get_type(void)
+{
+   // This shouldn't be ever called.
+   abort();
+
+   return GDK_TYPE_X11_DISPLAY;
+}
+