diff --git a/rpc/responses.go b/rpc/responses.go
index 45a2fa18b..0f67299fc 100644
--- a/rpc/responses.go
+++ b/rpc/responses.go
@@ -11,7 +11,7 @@ type BlockRes struct {
 	BlockNumber     *hexnum           `json:"number"`
 	BlockHash       *hexdata          `json:"hash"`
 	ParentHash      *hexdata          `json:"parentHash"`
-	Nonce           *hexnum           `json:"nonce"`
+	Nonce           *hexdata          `json:"nonce"`
 	Sha3Uncles      *hexdata          `json:"sha3Uncles"`
 	LogsBloom       *hexdata          `json:"logsBloom"`
 	TransactionRoot *hexdata          `json:"transactionRoot"`
@@ -41,7 +41,7 @@ func NewBlockRes(block *types.Block, fullTx bool) *BlockRes {
 	res.BlockNumber = newHexNum(block.Number())
 	res.BlockHash = newHexData(block.Hash())
 	res.ParentHash = newHexData(block.ParentHash())
-	res.Nonce = newHexNum(block.Header().Nonce)
+	res.Nonce = newHexData(block.Header().Nonce)
 	res.Sha3Uncles = newHexData(block.Header().UncleHash)
 	res.LogsBloom = newHexData(block.Bloom())
 	res.TransactionRoot = newHexData(block.Header().TxHash)
diff --git a/rpc/responses_test.go b/rpc/responses_test.go
index 702fc5c22..949e1794b 100644
--- a/rpc/responses_test.go
+++ b/rpc/responses_test.go
@@ -34,7 +34,7 @@ func TestNewBlockRes(t *testing.T) {
 		"number":          reNum,
 		"hash":            reHash,
 		"parentHash":      reHash,
-		"nonce":           reNum,
+		"nonce":           reData,
 		"sha3Uncles":      reHash,
 		"logsBloom":       reData,
 		"transactionRoot": reHash,