Build/fix error

[mengdemao]

fix build error

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.00%. Comparing base (557e2a3) to head (7a19d55). Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #34 +/- ## ========================================== + Coverage 82.45% 84.00% +1.54% ========================================== Files 6 4 -2 Lines 57 50 -7 Branches 22 19 -3 ========================================== - Hits 47 42 -5 + Partials 10 8 -2 ``` | [Flag](https://app.codecov.io/gh/mengdemao/lazybsd/pull/34/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%AD%9F%E5%BE%B7%E8%8C%82) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/mengdemao/lazybsd/pull/34/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%AD%9F%E5%BE%B7%E8%8C%82) | `84.00% <ø> (+1.54%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E5%AD%9F%E5%BE%B7%E8%8C%82#carryforward-flags-in-the-pull-request-comment) to find out more.

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