diff --git a/include/boost/math/special_functions/detail/iconv.hpp b/include/boost/math/special_functions/detail/iconv.hpp
index 8916eaed1..4256ffcc8 100644
--- a/include/boost/math/special_functions/detail/iconv.hpp
+++ b/include/boost/math/special_functions/detail/iconv.hpp
@@ -25,7 +25,7 @@ template <class T, class Policy>
 inline int iconv_imp(T v, Policy const& pol, mpl::false_ const&)
 {
    BOOST_MATH_STD_USING
-   return iround(v);
+   return iround(v, pol);
 }
 
 template <class T, class Policy>
diff --git a/include/boost/math/special_functions/lanczos.hpp b/include/boost/math/special_functions/lanczos.hpp
index 0c8c4c238..ed891549f 100644
--- a/include/boost/math/special_functions/lanczos.hpp
+++ b/include/boost/math/special_functions/lanczos.hpp
@@ -423,7 +423,7 @@ struct lanczos13 : public mpl::int_<72>
          static_cast<T>(BOOST_MATH_BIG_CONSTANT(T, 72, -0.9685385411006641478305219367315965391289e-9)),
       };
       T result = 0;
-      T z = z = 2;
+      T z = dz + 2;
       for(unsigned k = 1; k <= sizeof(d)/sizeof(d[0]); ++k)
       {
          result += (-d[k-1]*dz)/(z + k*z + k*k - 1);