diff --git a/appl/rcp/extern.h b/appl/rcp/extern.h
index c4d770d3f..a41ce6eae 100644
--- a/appl/rcp/extern.h
+++ b/appl/rcp/extern.h
@@ -41,11 +41,11 @@ typedef struct {
 
 extern int iamremote;
 
-BUF	*allocbuf __P((BUF *, int, int));
-char	*colon __P((char *));
-void	 lostconn __P((int));
-void	 nospace __P((void));
-int	 okname __P((char *));
-void	 run_err __P((const char *, ...));
-int	 susystem __P((char *, int));
-void	 verifydir __P((char *));
+BUF	*allocbuf (BUF *, int, int);
+char	*colon (char *);
+void	 lostconn (int);
+void	 nospace (void);
+int	 okname (char *);
+void	 run_err (const char *, ...);
+int	 susystem (char *, int);
+void	 verifydir (char *);