diff --git a/src/encoding/tlv.hpp b/src/encoding/tlv.hpp
index 1ea0936..890ea84 100644
--- a/src/encoding/tlv.hpp
+++ b/src/encoding/tlv.hpp
@@ -49,6 +49,7 @@
   SignatureType = 22,
   KeyLocator    = 23,
   KeyLocatorDigest = 24,
+  FinalBlockId  = 25,
 
   AppPrivateBlock1 = 128,
   AppPrivateBlock2 = 32767