diff --git a/include/osmocom/gsm/gsup.h b/include/osmocom/gsm/gsup.h
index 660ffd48a..ed1ef2a28 100644
--- a/include/osmocom/gsm/gsup.h
+++ b/include/osmocom/gsm/gsup.h
@@ -72,6 +72,8 @@ enum osmo_gsup_message_type {
 	OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR	= 0b00001001,
 	OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT	= 0b00001010,
 
+	OSMO_GSUP_MSGT_AUTH_FAIL_REPORT		= 0b00001011,
+
 	OSMO_GSUP_MSGT_PURGE_MS_REQUEST		= 0b00001100,
 	OSMO_GSUP_MSGT_PURGE_MS_ERROR		= 0b00001101,
 	OSMO_GSUP_MSGT_PURGE_MS_RESULT		= 0b00001110,