diff --git a/crypto/block/block.tlb b/crypto/block/block.tlb
index 99dfdb522..db6253ea1 100644
--- a/crypto/block/block.tlb
+++ b/crypto/block/block.tlb
@@ -464,7 +464,7 @@ block#11ef55aa global_id:int32
   state_update:^(MERKLE_UPDATE ShardState) 
   extra:^BlockExtra = Block;
 
-block_extra in_msg_descr:^InMsgDescr
+block_extra#4a33f6fd in_msg_descr:^InMsgDescr
   out_msg_descr:^OutMsgDescr
   account_blocks:^ShardAccountBlocks
   rand_seed:bits256