diff --git a/appl/telnet/libtelnet/auth-proto.h b/appl/telnet/libtelnet/auth-proto.h
index f6b566a37..a57f39e1a 100644
--- a/appl/telnet/libtelnet/auth-proto.h
+++ b/appl/telnet/libtelnet/auth-proto.h
@@ -61,7 +61,7 @@ Authenticator *findauthenticator (int, int);
 int auth_wait (char *, size_t);
 void auth_disable_name (char *);
 void auth_finished (Authenticator *, int);
-void auth_gen_printsub (unsigned char *, int, unsigned char *, int);
+void auth_gen_printsub (unsigned char *, int, unsigned char *, size_t);
 void auth_init (const char *, int);
 void auth_is (unsigned char *, int);
 void auth_name(unsigned char*, int);
@@ -69,7 +69,7 @@ void auth_reply (unsigned char *, int);
 void auth_request (void);
 void auth_send (unsigned char *, int);
 void auth_send_retry (void);
-void auth_printsub(unsigned char*, int, unsigned char*, int);
+void auth_printsub(unsigned char*, int, unsigned char*, size_t);
 int getauthmask(char *type, int *maskp);
 int auth_enable(char *type);
 int auth_disable(char *type);
@@ -78,8 +78,6 @@ int auth_togdebug(int on);
 int auth_status(void);
 int auth_sendname(unsigned char *cp, int len);
 void auth_debug(int mode);
-void auth_gen_printsub(unsigned char *data, int cnt,
-		       unsigned char *buf, int buflen);
 
 #ifdef UNSAFE
 int unsafe_init (Authenticator *, int);