diff --git a/src/CryptoNoteCore/Core.cpp b/src/CryptoNoteCore/Core.cpp
index 81d6602f9b..005a300dc0 100755
--- a/src/CryptoNoteCore/Core.cpp
+++ b/src/CryptoNoteCore/Core.cpp
@@ -1050,6 +1050,8 @@ bool Core::queryBlocksLite(const std::vector<Crypto::Hash>& knownBlockIds, uint6
       std::list<Crypto::Hash> missedTxs;
       lbs->getTransactions(b.transactionHashes, txs, missedTxs);
 
+      b.majorVersion = BLOCK_MAJOR_VERSION_4; // Workaround backward compatible with old wallets, i.e. serialize without signature
+
       item.block = asString(toBinaryArray(b));
 
       for (const auto& tx: txs) {