diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c
index 918bb9b9d9..fb88aa13da 100644
--- a/isisd/isis_tlvs.c
+++ b/isisd/isis_tlvs.c
@@ -40,7 +40,7 @@
 
 DEFINE_MTYPE_STATIC(ISISD, ISIS_TLV, "ISIS TLVs");
 DEFINE_MTYPE(ISISD, ISIS_SUBTLV, "ISIS Sub-TLVs");
-DEFINE_MTYPE_STATIC(ISISD, ISIS_SUBSUBTLV, "ISIS Sub-Sub-TLVs");
+DEFINE_MTYPE(ISISD, ISIS_SUBSUBTLV, "ISIS Sub-Sub-TLVs");
 DEFINE_MTYPE_STATIC(ISISD, ISIS_MT_ITEM_LIST, "ISIS MT Item Lists");
 
 typedef int (*unpack_tlv_func)(enum isis_tlv_context context, uint8_t tlv_type,
diff --git a/isisd/isis_tlvs.h b/isisd/isis_tlvs.h
index 825610ed35..fee0b5a363 100644
--- a/isisd/isis_tlvs.h
+++ b/isisd/isis_tlvs.h
@@ -22,6 +22,7 @@
 #include "lib/srv6.h"
 
 DECLARE_MTYPE(ISIS_SUBTLV);
+DECLARE_MTYPE(ISIS_SUBSUBTLV);
 
 struct lspdb_head;
 struct sr_prefix_cfg;