diff --git a/src/primitives/block.h b/src/primitives/block.h
index 520683d5e..97e9a97e0 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -241,6 +241,7 @@ public:
         block.nTime          = nTime;
         block.nBits          = nBits;
         block.nNonce         = nNonce;
+        block.cnHeader       = cnHeader;
         block.SetLegacy(legacyMode);
         return block;
     }
diff --git a/src/test/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index d1f0b206c..40900b745 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -47,6 +47,7 @@ static CBlock BuildBlockTestCase() {
     bool mutated;
     block.hashMerkleRoot = BlockMerkleRoot(block, &mutated);
     assert(!mutated);
+    block.cnHeader.major_version = Params().GetConsensus().GetCryptonoteMajorVersion();
     block.cnHeader.prev_id = block.GetHash();
     while (!CheckProofOfWork(block.GetPoWHash(), block.nBits, Params().GetConsensus())) ++block.cnHeader.nonce;
     return block;
@@ -293,6 +294,7 @@ BOOST_AUTO_TEST_CASE(EmptyBlockRoundTripTest)
     bool mutated;
     block.hashMerkleRoot = BlockMerkleRoot(block, &mutated);
     assert(!mutated);
+    block.cnHeader.major_version = Params().GetConsensus().GetCryptonoteMajorVersion();
     block.cnHeader.prev_id = block.GetHash();
     while (!CheckProofOfWork(block.GetPoWHash(), block.nBits, Params().GetConsensus())) ++block.cnHeader.nonce;
 
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 05b0bacd8..ba74e3933 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -154,6 +154,7 @@ TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransaction>&
         IncrementExtraNonce(&block, chainActive.Tip(), extraNonce);
     }
 
+    block.cnHeader.major_version = Params().GetConsensus().GetCryptonoteMajorVersion();
     block.cnHeader.prev_id = block.GetHash();
     while (!CheckProofOfWork(block.GetPoWHash(), block.nBits, chainparams.GetConsensus())) ++block.cnHeader.nonce;
 
diff --git a/src/test/validation_block_tests.cpp b/src/test/validation_block_tests.cpp
index c430d9065..a5de1ae82 100644
--- a/src/test/validation_block_tests.cpp
+++ b/src/test/validation_block_tests.cpp
@@ -71,6 +71,7 @@ std::shared_ptr<CBlock> FinalizeBlock(std::shared_ptr<CBlock> pblock)
 {
     pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
 
+    pblock->cnHeader.major_version = Params().GetConsensus().GetCryptonoteMajorVersion();
     pblock->cnHeader.prev_id = pblock->GetHash();
     while (!CheckProofOfWork(pblock->GetPoWHash(), pblock->nBits, Params().GetConsensus())) {
         ++(pblock->cnHeader.nonce);