diff --git a/appl/telnet/libtelnet/kerberos5.c b/appl/telnet/libtelnet/kerberos5.c
index 570b63a72..23b616a80 100644
--- a/appl/telnet/libtelnet/kerberos5.c
+++ b/appl/telnet/libtelnet/kerberos5.c
@@ -206,6 +206,8 @@ kerberos5_send(char *name, Authenticator *ap)
 	ap_opts = AP_OPTS_MUTUAL_REQUIRED;
     else
 	ap_opts = 0;
+
+    ap_opts |= AP_OPTS_USE_SUBKEY;
     
     ret = krb5_auth_con_init (context, &auth_context);
     if (ret) {