diff --git a/library/GSUP_Types.ttcn b/library/GSUP_Types.ttcn
index b3154ac..7d6af7a 100644
--- a/library/GSUP_Types.ttcn
+++ b/library/GSUP_Types.ttcn
@@ -172,7 +172,8 @@
 	OSMO_GSUP_MESSAGE_CLASS_SUBSCRIBER_MANAGEMENT	(1),
 	OSMO_GSUP_MESSAGE_CLASS_SMS			(2),
 	OSMO_GSUP_MESSAGE_CLASS_USSD			(3),
-	OSMO_GSUP_MESSAGE_CLASS_INTER_MSC		(4)
+	OSMO_GSUP_MESSAGE_CLASS_INTER_MSC		(4),
+	OSMO_GSUP_MESSAGE_CLASS_IPSEC_EPDG		(5)
 } with { variant "FIELDLENGTH(8)" };
 
 type record GSUP_MSISDN {