--- a/inews/inews.c
+++ b/inews/inews.c
@@ -47,6 +47,8 @@ extern	FILE	*ser_wr_fp;
 
 char	host_name[256];
 
+void append_signature(void);
+
 main(argc, argv)
 int	argc;
 char	*argv[];
@@ -181,7 +183,7 @@ char	*argv[];
  * The rn-style DOTDIR environmental variable is used if present.
  */
 
-append_signature()
+void append_signature(void)
 {
 	char	line[256], sigfile[256];
 	char	*cp;