diff --git a/block.go b/block.go
index 13e10d5..0e5e514 100644
--- a/block.go
+++ b/block.go
@@ -208,7 +208,7 @@ func NewBlock(msgBlock *btcwire.MsgBlock) *Block {
 func NewBlockFromBytes(serializedBlock []byte) (*Block, error) {
 	// Deserialize the bytes into a MsgBlock.
 	var msgBlock btcwire.MsgBlock
-	br := bytes.NewBuffer(serializedBlock)
+	br := bytes.NewReader(serializedBlock)
 	err := msgBlock.Deserialize(br)
 	if err != nil {
 		return nil, err
diff --git a/tx.go b/tx.go
index e3c1cc2..1660bf0 100644
--- a/tx.go
+++ b/tx.go
@@ -74,7 +74,7 @@ func NewTx(msgTx *btcwire.MsgTx) *Tx {
 func NewTxFromBytes(serializedTx []byte) (*Tx, error) {
 	// Deserialize the bytes into a MsgTx.
 	var msgTx btcwire.MsgTx
-	br := bytes.NewBuffer(serializedTx)
+	br := bytes.NewReader(serializedTx)
 	err := msgTx.Deserialize(br)
 	if err != nil {
 		return nil, err