diff --git a/src/gui_x11.c b/src/gui_x11.c
index e6e6f61..5a0fe8d 100644
--- a/src/gui_x11.c
+++ b/src/gui_x11.c
@@ -2234,8 +2234,7 @@
 
 /* NOT USED YET
     static int
-fontset_descent(fs)
-    XFontSet fs;
+fontset_descent(XFontSet fs)
 {
     XFontSetExtents *extents;