diff --git a/src/gui_x11.c b/src/gui_x11.c
index 90e6fbd..03300e4 100644
--- a/src/gui_x11.c
+++ b/src/gui_x11.c
@@ -1992,6 +1992,7 @@
  * Return the name of font "font" in allocated memory.
  * Don't know how to get the actual name, thus use the provided name.
  */
+/*ARGSUSED*/
     char_u *
 gui_mch_get_fontname(font, name)
     GuiFont font;