diff --git a/internal/hmyapi/types.go b/internal/hmyapi/types.go
index 4d85865ed..ca9a249ef 100644
--- a/internal/hmyapi/types.go
+++ b/internal/hmyapi/types.go
@@ -105,7 +105,7 @@ func RPCMarshalBlock(b *types.Block, inclTx bool, fullTx bool) (map[string]inter
 		"size":             hexutil.Uint64(b.Size()),
 		"gasLimit":         hexutil.Uint64(head.GasLimit),
 		"gasUsed":          hexutil.Uint64(head.GasUsed),
-		"timestamp":        head.Time, // TODO(ricl): should be hexutil.Uint64
+		"timestamp":        hexutil.Uint64(head.Time.Uint64()),
 		"transactionsRoot": head.TxHash,
 		"receiptsRoot":     head.ReceiptHash,
 	}