fix precompilation issue

[baggepinnen]

closes #171

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.46%. Comparing base (a19ea15) to head (3fe954a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #172   +/-   ##
=======================================
  Coverage   89.46%   89.46%           
=======================================
  Files          20       20           
  Lines        1168     1168           
=======================================
  Hits         1045     1045           
  Misses        123      123           

Flag	Coverage Δ
unittests	89.46% <ø> (ø)

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