diff --git a/isisd/isis_tlvs.h b/isisd/isis_tlvs.h
index e97982610d..a42522adfc 100644
--- a/isisd/isis_tlvs.h
+++ b/isisd/isis_tlvs.h
@@ -476,6 +476,8 @@ enum isis_tlv_type {
 
 	ISIS_SUBTLV_SRV6_END_SID = 5,
 
+	ISIS_SUBSUBTLV_SRV6_SID_STRUCTURE = 1,
+
 	/* draft-ietf-lsr-isis-srv6-extensions */
 	ISIS_SUBSUBTLV_SID_STRUCTURE = 1,