diff --git a/src/txdb.cpp b/src/txdb.cpp
index 5ff270faa4..bdaeda42c9 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -408,8 +408,8 @@ bool CBlockTreeDB::ReadFlag(const std::string &name, bool &fValue) {
 
 bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex)
 {
+    AssertLockHeld(::cs_main);
     std::unique_ptr<CDBIterator> pcursor(NewIterator());
-
     pcursor->Seek(std::make_pair(DB_BLOCK_INDEX, uint256()));
 
     // Load m_block_index
@@ -423,19 +423,16 @@ bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams,
                 CBlockIndex* pindexNew = insertBlockIndex(diskindex.GetBlockHash());
                 pindexNew->pprev          = insertBlockIndex(diskindex.hashPrev);
                 pindexNew->nHeight        = diskindex.nHeight;
+                pindexNew->nFile          = diskindex.nFile;
+                pindexNew->nDataPos       = diskindex.nDataPos;
+                pindexNew->nUndoPos       = diskindex.nUndoPos;
                 pindexNew->nVersion       = diskindex.nVersion;
                 pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
                 pindexNew->nTime          = diskindex.nTime;
                 pindexNew->nBits          = diskindex.nBits;
                 pindexNew->nNonce         = diskindex.nNonce;
+                pindexNew->nStatus        = diskindex.nStatus;
                 pindexNew->nTx            = diskindex.nTx;
-                {
-                    LOCK(::cs_main);
-                    pindexNew->nFile = diskindex.nFile;
-                    pindexNew->nDataPos = diskindex.nDataPos;
-                    pindexNew->nUndoPos = diskindex.nUndoPos;
-                    pindexNew->nStatus = diskindex.nStatus;
-                }
 
                 if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, consensusParams)) {
                     return error("%s: CheckProofOfWork failed: %s", __func__, pindexNew->ToString());
diff --git a/src/txdb.h b/src/txdb.h
index 54c79ade14..d00e5629ee 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -104,7 +104,8 @@ public:
 
     bool WriteFlag(const std::string &name, bool fValue);
     bool ReadFlag(const std::string &name, bool &fValue);
-    bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex);
+    bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex)
+        EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 };
 
 #endif // BITCOIN_TXDB_H