diff --git a/TestHelper.cpp b/TestHelper.cpp
index 5a579702a..8cb4e11c0 100644
--- a/TestHelper.cpp
+++ b/TestHelper.cpp
@@ -108,6 +108,12 @@ void ImportTest::importState(json_spirit::mObject& _o, State& _state)
 		BOOST_REQUIRE(o.count("storage") > 0);
 		BOOST_REQUIRE(o.count("code") > 0);
 
+		bigint biValue256 = bigint("115792089237316195423570985008687907853269984665640564039457584007913129639936");
+		if (bigint(o["balance"].get_str()) >= biValue256)
+			BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("State 'balance' is equal or grater than 2**256") );
+		if (bigint(o["nonce"].get_str()) >= biValue256)
+			BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("State 'nonce' is equal or grater than 2**256") );
+
 		Address address = Address(i.first);
 
 		bytes code = importCode(o);
@@ -140,6 +146,16 @@ void ImportTest::importTransaction(json_spirit::mObject& _o)
 	BOOST_REQUIRE(_o.count("secretKey") > 0);
 	BOOST_REQUIRE(_o.count("data") > 0);
 
+	bigint biValue256 = bigint("115792089237316195423570985008687907853269984665640564039457584007913129639936");
+	if (bigint(_o["nonce"].get_str()) >= biValue256)
+		BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("Transaction 'nonce' is equal or grater than 2**256") );
+	if (bigint(_o["gasPrice"].get_str()) >= biValue256)
+		BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("Transaction 'gasPrice' is equal or grater than 2**256") );
+	if (bigint(_o["gasLimit"].get_str()) >= biValue256)
+		BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("Transaction 'gasLimit' is equal or grater than 2**256") );
+	if (bigint(_o["value"].get_str()) >= biValue256)
+		BOOST_THROW_EXCEPTION(Exception() << errinfo_comment("Transaction 'value' is equal or grater than 2**256") );
+
 	m_transaction = _o["to"].get_str().empty() ?
 		Transaction(toInt(_o["value"]), toInt(_o["gasPrice"]), toInt(_o["gasLimit"]), importData(_o), toInt(_o["nonce"]), Secret(_o["secretKey"].get_str())) :
 		Transaction(toInt(_o["value"]), toInt(_o["gasPrice"]), toInt(_o["gasLimit"]), Address(_o["to"].get_str()), importData(_o), toInt(_o["nonce"]), Secret(_o["secretKey"].get_str()));