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-rw-r--r--boost/math/special_functions/detail/bessel_kn.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/math/special_functions/detail/bessel_kn.hpp b/boost/math/special_functions/detail/bessel_kn.hpp
index 5f01460995..e3a5023c63 100644
--- a/boost/math/special_functions/detail/bessel_kn.hpp
+++ b/boost/math/special_functions/detail/bessel_kn.hpp
@@ -22,6 +22,7 @@ namespace boost { namespace math { namespace detail{
template <typename T, typename Policy>
T bessel_kn(int n, T x, const Policy& pol)
{
+ BOOST_MATH_STD_USING
T value, current, prev;
using namespace boost::math::tools;