diff --git a/src/libcharon/sa/authenticators/authenticator.h b/src/libcharon/sa/authenticators/authenticator.h
index 81164772d..1161583c9 100644
--- a/src/libcharon/sa/authenticators/authenticator.h
+++ b/src/libcharon/sa/authenticators/authenticator.h
@@ -79,10 +79,20 @@ enum auth_method_t {
 	 */
 	AUTH_XAUTH_INIT_PSK = 256,
 
+	/**
+	 * IKEv1 responder XAUTH with PSK, outside of IANA range
+	 */
+	AUTH_XAUTH_RESP_PSK,
+
 	/**
 	 * IKEv1 initiator XAUTH with RSA, outside of IANA range
 	 */
 	AUTH_XAUTH_INIT_RSA,
+
+	/**
+	 * IKEv1 responder XAUTH with RSA, outside of IANA range
+	 */
+	AUTH_XAUTH_RESP_RSA,
 };
 
 /**