Fix warning about XChangeProperty argument type

diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index 6e3b788b085a0b6e921c44bf0a33129c1e05eaa4..204e6bfcfdd5153244f9844924475f96597c0502 100644 (file)
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -2611,7 +2611,7 @@ gdk_window_set_startup_id (GdkWindow   *window,
        XChangeProperty (GDK_DISPLAY_XDISPLAY (display), GDK_WINDOW_XID (window),
                         gdk_x11_get_xatom_by_name_for_display (display, "_NET_STARTUP_ID"), 
                         gdk_x11_get_xatom_by_name_for_display (display, "UTF8_STRING"), 8,
-                        PropModeReplace, startup_id, strlen (startup_id));
+                        PropModeReplace, (unsigned char *)startup_id, strlen (startup_id));
       else
        XDeleteProperty (GDK_DISPLAY_XDISPLAY (display), GDK_WINDOW_XID (window),
                         gdk_x11_get_xatom_by_name_for_display (display, "_NET_STARTUP_ID"));