diff --git a/whois.c b/whois.c
index be5e820..a5d9003 100644
--- a/whois.c
+++ b/whois.c
@@ -41,7 +41,6 @@
 #endif
 
 /* prototypes referenced in data.h */
-static void find_referral_server_6bone(char **, const char *);
 static void find_referral_server_apnic(char **, const char *);
 static void find_referral_server_arin(char **, const char *);
 static void find_referral_server_iana(char **, const char *);
diff --git a/whois.h b/whois.h
index 22a7c56..3cc9727 100644
--- a/whois.h
+++ b/whois.h
@@ -1,9 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 #include "utils.h"
 
-/* 6bone referto: extension */
-#define REFERTO_FORMAT	"%% referto: whois -h %255s -p %15s %1021[^\n\r]"
-
 #define HIDE_TO_THE_END  -3
 #define HIDE_DISABLED    -2
 #define HIDE_NOT_STARTED -1