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diff --git a/include/complex b/include/complex
index 7f44242..066141b 100644
--- a/include/complex
+++ b/include/complex
@@ -1375,7 +1375,8 @@ acos(const complex<_Tp>& __x)
}
if (std::__constexpr_isinf(__x.imag()))
return complex<_Tp>(__pi/_Tp(2), -__x.imag());
- if (__x.real() == 0 && (__x.imag() == 0 || std::isnan(__x.imag())))
+ // Somehow isnan can be a macro, so we use __constexpr_isnan
+ if (__x.real() == 0 && (__x.imag() == 0 || std::__constexpr_isnan(__x.imag())))
return complex<_Tp>(__pi/_Tp(2), -__x.imag());
complex<_Tp> __z = std::log(__x + std::sqrt(std::__sqr(__x) - _Tp(1)));
if (std::signbit(__x.imag()))
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