@@ -82,9 +82,9 @@ func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error

 	cmd := reexec.Command("docker-untar", dest)

 	cmd.Stdin = decompressedArchive

 	cmd.ExtraFiles = append(cmd.ExtraFiles, r)

-	var output bytes.Buffer

-	cmd.Stdout = &output

-	cmd.Stderr = &output

+	output := bytes.NewBuffer(nil)

+	cmd.Stdout = output

+	cmd.Stderr = output

 	if err := cmd.Start(); err != nil {

 		return fmt.Errorf("Untar error on re-exec cmd: %v", err)