diff --git a/zdump.c b/zdump.c
index 88fc42f..5a685e9 100644
--- a/zdump.c
+++ b/zdump.c
@@ -134,8 +134,8 @@ static char	elsieid[] = "%W%";
 #endif /* !defined P */
 
 extern char **	environ;
-extern int	getopt P((int argc, char * const argv[],
-			const char * options));
+extern int	getopt(int argc, char * const argv[],
+			const char * options);
 extern char *	optarg;
 extern int	optind;
 extern char *	tzname[2];
@@ -146,15 +146,15 @@ static size_t	longest;
 static char *	progname;
 static int	warned;
 
-static char *	abbr P((struct tm * tmp));
-static void	abbrok P((const char * abbrp, const char * zone));
-static long	delta P((struct tm * newp, struct tm * oldp));
-static void	dumptime P((const struct tm * tmp));
-static time_t	hunt P((char * name, time_t lot, time_t	hit));
-static void	setabsolutes P((void));
-static void	show P((char * zone, time_t t, int v));
-static const char *	tformat P((void));
-static time_t	yeartot P((long y));
+static char *	abbr(struct tm * tmp);
+static void	abbrok(const char * abbrp, const char * zone);
+static long	delta(struct tm * newp, struct tm * oldp);
+static void	dumptime(const struct tm * tmp);
+static time_t	hunt(char * name, time_t lot, time_t	hit);
+static void	setabsolutes(void);
+static void	show(char * zone, time_t t, int v);
+static const char *	tformat(void);
+static time_t	yeartot(long y);
 
 #ifndef TYPECHECK
 #define my_localtime	localtime