diff --git a/src/test/fuzz/tx_pool.cpp b/src/test/fuzz/tx_pool.cpp
index 4c1037f1e7..c32c965ab0 100644
--- a/src/test/fuzz/tx_pool.cpp
+++ b/src/test/fuzz/tx_pool.cpp
@@ -86,7 +86,7 @@ void Finish(FuzzedDataProvider& fuzzed_data_provider, MockedTxPool& tx_pool, CCh
         BlockAssembler::Options options;
         options.nBlockMaxWeight = fuzzed_data_provider.ConsumeIntegralInRange(0U, MAX_BLOCK_WEIGHT);
         options.blockMinFeeRate = CFeeRate{ConsumeMoney(fuzzed_data_provider, /*max=*/COIN)};
-        auto assembler = BlockAssembler{chainstate, *static_cast<CTxMemPool*>(&tx_pool), ::Params(), options};
+        auto assembler = BlockAssembler{chainstate, *static_cast<CTxMemPool*>(&tx_pool), chainstate.m_params, options};
         auto block_template = assembler.CreateNewBlock(CScript{} << OP_TRUE);
         Assert(block_template->block.vtx.size() >= 1);
     }
@@ -224,13 +224,12 @@ FUZZ_TARGET_INIT(tx_pool_standard, initialize_tx_pool)
         // Make sure ProcessNewPackage on one transaction works and always fully validates the transaction.
         // The result is not guaranteed to be the same as what is returned by ATMP.
         const auto result_package = WITH_LOCK(::cs_main,
-                                    return ProcessNewPackage(node.chainman->ActiveChainstate(), tx_pool, {tx}, true));
+                                    return ProcessNewPackage(chainstate, tx_pool, {tx}, true));
         auto it = result_package.m_tx_results.find(tx->GetWitnessHash());
         Assert(it != result_package.m_tx_results.end());
         Assert(it->second.m_result_type == MempoolAcceptResult::ResultType::VALID ||
                it->second.m_result_type == MempoolAcceptResult::ResultType::INVALID);
 
-        CChainState& chainstate{node.chainman->ActiveChainstate()};
         const auto res = WITH_LOCK(::cs_main, return AcceptToMemoryPool(tx_pool, chainstate, tx, GetTime(), bypass_limits, /* test_accept= */ false));
         const bool accepted = res.m_result_type == MempoolAcceptResult::ResultType::VALID;
         SyncWithValidationInterfaceQueue();