diff --git a/sharding/vmc.go b/sharding/vmc.go
index fb9d52f4d..f385edc9a 100644
--- a/sharding/vmc.go
+++ b/sharding/vmc.go
@@ -19,7 +19,7 @@ import (
 var (
 	// ABI/bytecode from https://github.com/enriquefynn/go-ethereum/blob/b1475e7c233d42d5c28d12826f8ee03b25cce8ae/sharding/contracts/validator_manager.sol
 	abi         = `[{"constant":true,"inputs":[],"name":"getValidatorsMaxIndex","outputs":[{"name":"","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_shardId","type":"int256"},{"name":"_txStartgas","type":"uint256"},{"name":"_txGasprice","type":"uint256"},{"name":"_data","type":"bytes12"}],"name":"txToShard","outputs":[{"name":"","type":"int256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"getAncestorDistance","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"name":"header","type":"bytes12"}],"name":"addHeader","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_valcodeAddr","type":"address"}],"name":"getShardList","outputs":[{"name":"","type":"bool[100]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getCollationGasLimit","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"_expectedPeriodNumber","type":"uint256"}],"name":"getPeriodStartPrevhash","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_shardId","type":"int256"}],"name":"sample","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_validatorIndex","type":"uint256"},{"name":"_sig","type":"bytes10"}],"name":"withdraw","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_receiptId","type":"int256"},{"name":"_txGasprice","type":"uint256"}],"name":"updataGasPrice","outputs":[{"name":"","type":"bool"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"name":"_validationCodeAddr","type":"address"},{"name":"_returnAddr","type":"address"}],"name":"deposit","outputs":[{"name":"","type":"int256"}],"payable":true,"stateMutability":"payable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]`
-	abiBytecode = []byte("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+	abiBytecode = common.Hex2Bytes("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 )
 
 // Verify validator management contract.