diff --git a/contracts/validator/validator_test.go b/contracts/validator/validator_test.go
index a6124af3c5..753f84cc39 100644
--- a/contracts/validator/validator_test.go
+++ b/contracts/validator/validator_test.go
@@ -129,7 +129,7 @@ func TestRewardBalance(t *testing.T) {
 
 	foundationAddr := common.HexToAddress(common.FoudationAddr)
 	totalReward := new(big.Int).SetInt64(15 * 1000)
-	rewards, err := contracts.GetRewardBalancesRate(foundationAddr, nil, acc3Addr, totalReward)
+	rewards, err := contracts.GetRewardBalancesRate(foundationAddr, acc3Addr, totalReward, baseValidator)
 	if err != nil {
 		t.Error("Fail to get reward balances rate.", err)
 	}
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index b18eb3b64b..a55d47e9fa 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -865,7 +865,7 @@ func (s *PublicBlockChainAPI) rpcOutputBlock(b *types.Block, inclTx bool, fullTx
 	if b.Number().Int64() > 0 {
 		engine := s.b.GetEngine()
 		addrBlockSigner := common.HexToAddress(common.BlockSigners)
-		signers, err = contracts.GetSignersFromContract(engine.(*XDPoS.XDPoS), addrBlockSigner, client, b.Hash())
+		signers, err = contracts.GetSignersFromContract(addrBlockSigner, client, b.Hash())
 		if err != nil {
 			log.Error("Fail to get signers from block signer SC.", "error", err)
 		}