fix compile on old gcc.

[ColinLeeo]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.93%. Comparing base (d0ff02c) to head (ecbeb4a).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #670      +/-   ##
===========================================
- Coverage    61.93%   61.93%   -0.01%     
===========================================
  Files          709      709              
  Lines        40129    40129              
  Branches      5649     5649              
===========================================
- Hits         24853    24852       -1     
- Misses       14575    14576       +1     
  Partials       701      701              

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