diff --git a/core/blockchain.go b/core/blockchain.go
index 8694639b80..f8e097bfc6 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2209,7 +2209,6 @@ func (bc *BlockChain) getResultBlock(block *types.Block, verifiedM2 bool) (*Resu
 
 // UpdateBlocksHashCache update BlocksHashCache by block number
 func (bc *BlockChain) UpdateBlocksHashCache(block *types.Block) []common.Hash {
-	var hashArr []common.Hash
 	blockNumber := block.Number().Uint64()
 	cached, ok := bc.blocksHashCache.Get(blockNumber)
 
@@ -2221,7 +2220,7 @@ func (bc *BlockChain) UpdateBlocksHashCache(block *types.Block) []common.Hash {
 		return hashArr
 	}
 
-	hashArr = []common.Hash{
+	hashArr := []common.Hash{
 		block.Hash(),
 	}
 	bc.blocksHashCache.Add(blockNumber, hashArr)