diff --git a/mix/ClientModel.cpp b/mix/ClientModel.cpp
index 93bcc7c92..a66335b5a 100644
--- a/mix/ClientModel.cpp
+++ b/mix/ClientModel.cpp
@@ -215,7 +215,6 @@ void ClientModel::executeSequence(std::vector<TransactionSettings> const& _seque
 						encoder.push(transaction.parameterValues.at(p)->encodeValue());
 					}
 
-
 					if (transaction.functionId.isEmpty())
 					{
 						Address newAddress = deployContract(contractCode, transaction);
@@ -226,9 +225,7 @@ void ClientModel::executeSequence(std::vector<TransactionSettings> const& _seque
 						}
 					}
 					else
-					{
 						callContract(m_contractAddress, encoder.encodedData(), transaction);
-					}
 				}
 				onNewTransaction();
 			}
diff --git a/mix/QVariableDefinition.cpp b/mix/QVariableDefinition.cpp
index 5049283da..a76388d68 100644
--- a/mix/QVariableDefinition.cpp
+++ b/mix/QVariableDefinition.cpp
@@ -70,19 +70,18 @@ void QIntType::setValue(dev::bigint _value)
 dev::bytes QIntType::encodeValue()
 {
 	dev::bigint i(value().toStdString());
-	if (i < 0)
-		i = i + dev::bigint("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff") + 1;
 	bytes ret(32);
-	toBigEndian(i, ret);
+	toBigEndian((u256)i, ret);
 	return ret;
 }
 
 void QIntType::decodeValue(dev::bytes const& _rawValue)
 {
-	dev::bigint bigint = dev::fromBigEndian<dev::bigint>(_rawValue);
-	if (((bigint >> 32) & 1) == 1)
-		bigint = bigint - dev::bigint("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff") - 1;
-	setValue(bigint);
+	dev::u256 un = dev::fromBigEndian<dev::u256>(_rawValue);
+	if (un >> 255)
+		setValue(-s256(~un + 1));
+	else
+		setValue(un);
 }
 
 /*
@@ -90,8 +89,8 @@ void QIntType::decodeValue(dev::bytes const& _rawValue)
  */
 dev::bytes QHashType::encodeValue()
 {
-	QByteArray b = value().toUtf8();
-	bytes r = bytes(b.begin(), b.end());
+	QByteArray bytesAr = value().toLocal8Bit();
+	bytes r = bytes(bytesAr.begin(), bytesAr.end());
 	return padded(r, 32);
 }