diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 3b05f84eee..6cadd324c9 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2009-2022 The Bitcoin Core developers
+// Copyright (c) 2009-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -371,22 +371,22 @@ static RPCHelpMan generateblock()
 
     ChainstateManager& chainman = EnsureChainman(node);
     {
-        std::unique_ptr<BlockTemplate> block_template{miner.createNewBlock({.use_mempool = false, .coinbase_output_script = coinbase_output_script})};
-        CHECK_NONFATAL(block_template);
+        LOCK(chainman.GetMutex());
+        {
+            std::unique_ptr<BlockTemplate> block_template{miner.createNewBlock({.use_mempool = false, .coinbase_output_script = coinbase_output_script})};
+            CHECK_NONFATAL(block_template);
 
-        block = block_template->getBlock();
-    }
+            block = block_template->getBlock();
+        }
 
-    CHECK_NONFATAL(block.vtx.size() == 1);
+        CHECK_NONFATAL(block.vtx.size() == 1);
 
-    // Add transactions
-    block.vtx.insert(block.vtx.end(), txs.begin(), txs.end());
-    RegenerateCommitments(block, chainman);
+        // Add transactions
+        block.vtx.insert(block.vtx.end(), txs.begin(), txs.end());
+        RegenerateCommitments(block, chainman);
 
-    {
-        LOCK(::cs_main);
         BlockValidationState state;
-        if (!TestBlockValidity(state, chainman.GetParams(), chainman.ActiveChainstate(), block, chainman.m_blockman.LookupBlockIndex(block.hashPrevBlock),  /*fCheckPOW=*/false, /*fCheckMerkleRoot=*/false)) {
+        if (!TestBlockValidity(state, chainman.GetParams(), chainman.ActiveChainstate(), block, chainman.m_blockman.LookupBlockIndex(block.hashPrevBlock), /*fCheckPOW=*/false, /*fCheckMerkleRoot=*/false)) {
             throw JSONRPCError(RPC_VERIFY_ERROR, strprintf("TestBlockValidity failed: %s", state.ToString()));
         }
     }