diff --git a/gdk/x11/gdkx11window.h b/gdk/x11/gdkx11window.h
index 47bd5c5e6c..88cc40fa80 100644
--- a/gdk/x11/gdkx11window.h
+++ b/gdk/x11/gdkx11window.h
@@ -55,6 +55,7 @@ GType    gdk_x11_window_get_type          (void);
 Window   gdk_x11_window_get_xid           (GdkWindow   *window);
 void     gdk_x11_window_set_user_time     (GdkWindow   *window,
                                            guint32      timestamp);
+GDK_AVAILABLE_IN_3_4
 void     gdk_x11_window_set_utf8_property    (GdkWindow *window,
 					      const gchar *name,
 					      const gchar *value);