diff --git a/blockchain/txbuilder/finalize.go b/blockchain/txbuilder/finalize.go
index 65b01c228..043954e28 100644
--- a/blockchain/txbuilder/finalize.go
+++ b/blockchain/txbuilder/finalize.go
@@ -32,9 +32,8 @@ func FinalizeTx(ctx context.Context, c *protocol.Chain, tx *types.Tx) error {
 	if err != nil {
 		return err
 	}
-	if err := tx.UnmarshalText(data); err != nil {
-		return err
-	}
+	tx.TxData.SerializedSize = uint64(len(data))
+	tx.Tx.SerializedSize = uint64(len(data))
 
 	_, err = c.ValidateTx(tx)
 	if errors.Root(err) == protocol.ErrBadTx {
diff --git a/version/version.go b/version/version.go
index ccb5ec9a7..782833d78 100644
--- a/version/version.go
+++ b/version/version.go
@@ -2,7 +2,7 @@ package version
 
 var (
 	// The full version string
-	Version = "0.4.4"
+	Version = "0.4.5"
 	// GitCommit is set with --ldflags "-X main.gitCommit=$(git rev-parse HEAD)"
 	GitCommit string
 )