diff --git a/src/cryptonote_core/cryptonote_basic.h b/src/cryptonote_core/cryptonote_basic.h
index 57dedc5..886cb6f 100644
--- a/src/cryptonote_core/cryptonote_basic.h
+++ b/src/cryptonote_core/cryptonote_basic.h
@@ -389,9 +389,11 @@ namespace cryptonote
   {
     bytecoin_block parent_block;
 
-    transaction miner_tx(blob_type);
+    transaction miner_tx;
     std::vector<crypto::hash> tx_hashes;
 
+    block() : miner_tx(blob_type) {}
+
     BEGIN_SERIALIZE_OBJECT()
       FIELDS(*static_cast<block_header *>(this))
       if (blob_type == BLOB_TYPE_FORKNOTE2)