diff --git a/eth/taiko_api_backend.go b/eth/taiko_api_backend.go
index 404e88ae21..6169b72633 100644
--- a/eth/taiko_api_backend.go
+++ b/eth/taiko_api_backend.go
@@ -107,8 +107,8 @@ func (s *TaikoAPIBackend) GetL2ParentHashes(blockID uint64) ([]common.Hash, erro
 // Get L2ParentBlocks retrieves the preceding 256 parent blocks given a block number.
 func (s *TaikoAPIBackend) GetL2ParentHeaders(blockID uint64) ([]*types.Header, error) {
 	var headers []*types.Header
-	for i := blockID; i != 0 && (blockID-i) < 256; i-- {
-		headers = append(headers, s.eth.blockchain.GetHeaderByNumber(blockID-i))
+	for i := 1; i < 256 && blockID >= uint64(i); i++ {
+		headers = append(headers, s.eth.blockchain.GetHeaderByNumber(blockID-uint64(i)))
 	}
 	return headers, nil
 }
diff --git a/ethclient/taiko_api_test.go b/ethclient/taiko_api_test.go
index 76b86b3263..ab3d77a722 100644
--- a/ethclient/taiko_api_test.go
+++ b/ethclient/taiko_api_test.go
@@ -112,16 +112,16 @@ func TestGetL2ParentHashes(t *testing.T) {
 
 	log.Info("hashes", "a", hashes)
 	require.Equal(t, 3, len(hashes))
-	require.Equal(t, blocks[0].Hash(), hashes[0])
+	require.Equal(t, blocks[2].Hash(), hashes[0])
 	require.Equal(t, blocks[1].Hash(), hashes[1])
-	require.Equal(t, blocks[2].Hash(), hashes[2])
+	require.Equal(t, blocks[0].Hash(), hashes[2])
 
 	hashes, err = ec.GetL2ParentHashes(context.Background(), common.Big2.Uint64())
 	require.Nil(t, err)
 
 	require.Equal(t, 2, len(hashes))
-	require.Equal(t, blocks[0].Hash(), hashes[0])
-	require.Equal(t, blocks[1].Hash(), hashes[1])
+	require.Equal(t, blocks[1].Hash(), hashes[0])
+	require.Equal(t, blocks[0].Hash(), hashes[1])
 
 	hashes, err = ec.GetL2ParentHashes(context.Background(), common.Big0.Uint64())
 	require.Nil(t, err)
@@ -136,16 +136,16 @@ func TestGetL2ParentBlocks(t *testing.T) {
 	require.Nil(t, err)
 
 	require.Equal(t, 3, len(res))
-	require.Equal(t, res[0]["hash"], blocks[0].Hash().String())
+	require.Equal(t, res[2]["hash"], blocks[0].Hash().String())
 	require.Equal(t, res[1]["hash"], blocks[1].Hash().String())
-	require.Equal(t, res[2]["hash"], blocks[2].Hash().String())
+	require.Equal(t, res[0]["hash"], blocks[2].Hash().String())
 
 	res, err = ec.GetL2ParentHeaders(context.Background(), common.Big2.Uint64())
 	require.Nil(t, err)
 
 	require.Equal(t, 2, len(res))
-	require.Equal(t, res[0]["hash"], blocks[0].Hash().String())
-	require.Equal(t, res[1]["hash"], blocks[1].Hash().String())
+	require.Equal(t, res[1]["hash"], blocks[0].Hash().String())
+	require.Equal(t, res[0]["hash"], blocks[1].Hash().String())
 
 	res, err = ec.GetL2ParentHeaders(context.Background(), common.Big0.Uint64())
 	require.Nil(t, err)