2 files changed, 2 insertions, 0 deletions
diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index d0e0109546..f2b520e893 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -114,6 +114,7 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
     for (const auto& p : benchmarks()) {
         TestingSetup test{CBaseChainParams::REGTEST};
         {
+            LOCK(cs_main);
             assert(::ChainActive().Height() == 0);
             const bool witness_enabled{IsWitnessEnabled(::ChainActive().Tip(), Params().GetConsensus())};
             assert(witness_enabled);
diff --git a/src/bench/duplicate_inputs.cpp b/src/bench/duplicate_inputs.cpp
index aa3f219b18..80ff13612c 100644
--- a/src/bench/duplicate_inputs.cpp
+++ b/src/bench/duplicate_inputs.cpp
@@ -29,6 +29,7 @@ static void DuplicateInputs(benchmark::State& state)
     CMutableTransaction coinbaseTx{};
     CMutableTransaction naughtyTx{};
 
+    LOCK(cs_main);
     CBlockIndex* pindexPrev = ::ChainActive().Tip();
     assert(pindexPrev != nullptr);
     block.nBits = GetNextWorkRequired(pindexPrev, &block, chainparams.GetConsensus());