diff --git a/appl/telnet/libtelnet/auth.c b/appl/telnet/libtelnet/auth.c
index eaba4a959..6d42fa9cf 100644
--- a/appl/telnet/libtelnet/auth.c
+++ b/appl/telnet/libtelnet/auth.c
@@ -155,6 +155,13 @@ Authenticator authenticators[] = {
 				kerberos5_printsub },
 #endif
 #ifdef	KRB4
+	{ AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
+				kerberos4_init,
+				kerberos4_send,
+				kerberos4_is,
+				kerberos4_reply,
+				kerberos4_status,
+				kerberos4_printsub },
 	{ AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
 				kerberos4_init,
 				kerberos4_send,