--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -680,10 +680,9 @@ ex_breakdel(eap)
 /*
  * ":breaklist".
  */
-/*ARGSUSED*/
     void
 ex_breaklist(eap)
-    exarg_T	*eap;
+    exarg_T	*eap UNUSED;
 {
     struct debuggy *bp;
     int		i;
@@ -1342,14 +1341,13 @@ autowrite_all()
 /*
  * return TRUE if buffer was changed and cannot be abandoned.
  */
-/*ARGSUSED*/
     int
 check_changed(buf, checkaw, mult_win, forceit, allbuf)
     buf_T	*buf;
     int		checkaw;	/* do autowrite if buffer was changed */
     int		mult_win;	/* check also when several wins for the buf */
     int		forceit;
-    int		allbuf;		/* may write all buffers */
+    int		allbuf UNUSED;	/* may write all buffers */
 {
     if (       !forceit
 	    && bufIsChanged(buf)
@@ -1759,12 +1757,11 @@ set_arglist(str)
  *
  * Return FAIL for failure, OK otherwise.
  */
-/*ARGSUSED*/
     static int
 do_arglist(str, what, after)
     char_u	*str;
-    int		what;
-    int		after;		/* 0 means before first one */
+    int		what UNUSED;
+    int		after UNUSED;		/* 0 means before first one */
 {
     garray_T	new_ga;
     int		exp_count;
@@ -2549,11 +2546,10 @@ ex_runtime(eap)
 
 static void source_callback __ARGS((char_u *fname, void *cookie));
 
-/*ARGSUSED*/
     static void
 source_callback(fname, cookie)
     char_u	*fname;
-    void	*cookie;
+    void	*cookie UNUSED;
 {
     (void)do_source(fname, FALSE, DOSO_NONE);
 }
@@ -2680,10 +2676,9 @@ do_in_runtimepath(name, all, callback, c
 /*
  * ":options"
  */
-/*ARGSUSED*/
     void
 ex_options(eap)
-    exarg_T	*eap;
+    exarg_T	*eap UNUSED;
 {
     cmd_source((char_u *)SYS_OPTWIN_FILE, NULL);
 }
@@ -3190,10 +3185,9 @@ theend:
 /*
  * ":scriptnames"
  */
-/*ARGSUSED*/
     void
 ex_scriptnames(eap)
-    exarg_T	*eap;
+    exarg_T	*eap UNUSED;
 {
     int i;
 
@@ -3317,12 +3311,11 @@ fgets_cr(s, n, stream)
  * Return a pointer to the line in allocated memory.
  * Return NULL for end-of-file or some error.
  */
-/* ARGSUSED */
     char_u *
 getsourceline(c, cookie, indent)
-    int		c;		/* not used */
+    int		c UNUSED;
     void	*cookie;
-    int		indent;		/* not used */
+    int		indent UNUSED;
 {
     struct source_cookie *sp = (struct source_cookie *)cookie;
     char_u		*line;
@@ -3649,10 +3642,9 @@ script_line_end()
  * ":scriptencoding": Set encoding conversion for a sourced script.
  * Without the multi-byte feature it's simply ignored.
  */
-/*ARGSUSED*/
     void
 ex_scriptencoding(eap)
-    exarg_T	*eap;
+    exarg_T	*eap UNUSED;
 {
 #ifdef FEAT_MBYTE
     struct source_cookie	*sp;
@@ -4101,10 +4093,9 @@ ex_language(eap)
  * Function given to ExpandGeneric() to obtain the possible arguments of the
  * ":language" command.
  */
-/*ARGSUSED*/
     char_u *
 get_lang_arg(xp, idx)
-    expand_T	*xp;
+    expand_T	*xp UNUSED;
     int		idx;
 {
     if (idx == 0)