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diff --git a/scipy/special/_faddeeva.cxx b/scipy/special/_faddeeva.cxx
index 9134516..159122c 100644
--- a/scipy/special/_faddeeva.cxx
+++ b/scipy/special/_faddeeva.cxx
@@ -130,7 +130,7 @@ double faddeeva_voigt_profile(double x, double sigma, double gamma)
if(sigma == 0){
if (gamma == 0){
- if (isnan(x))
+ if (std::isnan(x))
return x;
if (x == 0)
return NPY_INFINITY;
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