diff --git a/tests/basic_evm_tester.cpp b/tests/basic_evm_tester.cpp
index 9a185108..8c132de2 100644
--- a/tests/basic_evm_tester.cpp
+++ b/tests/basic_evm_tester.cpp
@@ -681,10 +681,10 @@ intx::uint128 basic_evm_tester::tx_data_cost(const silkworm::Transaction& txn) c
     }
 
     const intx::uint128 non_zero_bytes{as_range::count_if(txn.data, [](uint8_t c) { return c != 0; })};
-    const intx::uint128 nonZeroGas{silkworm::fee::kGTxDataNonZeroIstanbul};
+    const intx::uint128 nonZeroGas{silkworm::protocol::fee::kGTxDataNonZeroIstanbul};
     gas += non_zero_bytes * nonZeroGas;
     const intx::uint128 zero_bytes{data_len - non_zero_bytes};
-    gas += zero_bytes * silkworm::fee::kGTxDataZero;
+    gas += zero_bytes * silkworm::protocol::fee::kGTxDataZero;
 
     return gas;
 }
diff --git a/tests/basic_evm_tester.hpp b/tests/basic_evm_tester.hpp
index f68af279..ec6ecaea 100644
--- a/tests/basic_evm_tester.hpp
+++ b/tests/basic_evm_tester.hpp
@@ -13,7 +13,7 @@
 #include <silkworm/core/rlp/encode.hpp>
 #include <silkworm/core/common/util.hpp>
 #include <silkworm/core/execution/address.hpp>
-#include <silkworm/core/chain/protocol_param.hpp>
+#include <silkworm/core/protocol/param.hpp>
 
 #include <secp256k1.h>
 
@@ -468,6 +468,8 @@ class basic_evm_tester : public evm_validating_tester
    bool scan_gcstore(std::function<bool(gcstore)> visitor) const;
    bool scan_account_code(std::function<bool(account_code)> visitor) const;
    void scan_balances(std::function<bool(evm_test::vault_balance_row)> visitor) const;
+
+   intx::uint128 tx_data_cost(const silkworm::Transaction& txn) const;
 };
 
 inline constexpr intx::uint256 operator"" _wei(const char* s) { return intx::from_string<intx::uint256>(s); }