diff --git a/ethereum/rpc/types/utils.go b/ethereum/rpc/types/utils.go
index 4aaf4149..7f1cd22f 100644
--- a/ethereum/rpc/types/utils.go
+++ b/ethereum/rpc/types/utils.go
@@ -168,7 +168,7 @@ func FormatBlock(
 		"miner":            validatorAddr,
 		"mixHash":          common.Hash{},
 		"difficulty":       (*hexutil.Big)(big.NewInt(0)),
-		"extraData":        "",
+		"extraData":        "0x",
 		"size":             hexutil.Uint64(size),
 		"gasLimit":         hexutil.Uint64(gasLimit), // Static gas limit
 		"gasUsed":          (*hexutil.Big)(gasUsed),
diff --git a/tests/rpc/rpc_test.go b/tests/rpc/rpc_test.go
index 614aa35f..5a2ee1d6 100644
--- a/tests/rpc/rpc_test.go
+++ b/tests/rpc/rpc_test.go
@@ -909,6 +909,6 @@ func TestEth_GetBlockByNumber(t *testing.T) {
 	block := make(map[string]interface{})
 	err := json.Unmarshal(rpcRes.Result, &block)
 	require.NoError(t, err)
-	require.Equal(t, "0x0", block["extraData"].(string))
+	require.Equal(t, "0x", block["extraData"].(string))
 	require.Equal(t, []interface{}{}, block["uncles"].([]interface{}))
 }