diff --git a/cmdline/fnmatch.c b/cmdline/fnmatch.c
index 073f0aa6..5d33fe05 100644
--- a/cmdline/fnmatch.c
+++ b/cmdline/fnmatch.c
@@ -124,7 +124,7 @@
    whose names are inconsistent.  */
 
 # if !defined _LIBC && !defined getenv
-extern char *getenv ();
+extern char *getenv (const char*);
 # endif
 
 # ifndef errno
@@ -135,9 +135,7 @@ extern int errno;
 
 # if !defined HAVE___STRCHRNUL && !defined _LIBC
 static char *
-__strchrnul (s, c)
-     const char *s;
-     int c;
+__strchrnul (const char *s, int c)
 {
   char *result = strchr (s, c);
   if (result == NULL)
@@ -159,11 +157,7 @@ static int internal_fnmatch __P ((const char *pattern, const char *string,
      internal_function;
 static int
 internal_function
-internal_fnmatch (pattern, string, no_leading_period, flags)
-     const char *pattern;
-     const char *string;
-     int no_leading_period;
-     int flags;
+internal_fnmatch (const char *pattern, const char *string, int no_leading_period, int flags)
 {
   register const char *p = pattern, *n = string;
   register unsigned char c;
@@ -481,10 +475,7 @@ internal_fnmatch (pattern, string, no_leading_period, flags)
 
 
 int
-fnmatch (pattern, string, flags)
-     const char *pattern;
-     const char *string;
-     int flags;
+fnmatch (const char *pattern, const char *string, int flags)
 {
   return internal_fnmatch (pattern, string, flags & FNM_PERIOD, flags);
 }