diff --git a/include/kyosu/functions/to_euler.hpp b/include/kyosu/functions/to_euler.hpp
index f304c9d8..d989b6b9 100644
--- a/include/kyosu/functions/to_euler.hpp
+++ b/include/kyosu/functions/to_euler.hpp
@@ -30,7 +30,7 @@ namespace kyosu::tags
                                              ) noexcept
     requires(I != J && J != K)
     {
-      return  kumi::tuple{zero(as<V>()), zero(as<V>()), zero(as<V>())};
+      return  kumi::tuple{eve::zero(eve::as<V>()), eve::zero(eve::as<V>()), eve::zero(eve::as<V>())};
     }
 
     template<typename T0, int I,  int J,  int K, bool Extrinsic>
diff --git a/include/kyosu/functions/to_rotation_matrix.hpp b/include/kyosu/functions/to_rotation_matrix.hpp
index 0aad3a21..a9dae758 100644
--- a/include/kyosu/functions/to_rotation_matrix.hpp
+++ b/include/kyosu/functions/to_rotation_matrix.hpp
@@ -24,7 +24,7 @@ namespace kyosu::tags
                                                , [[maybe_unused]] V const & q
                                                , nor<normalize>) noexcept
     {
-      if constexpr (!normalize) EVE_ASSERT(eve::all(kyosu::is_unitary(v)), "some quaternions are not unitary");
+      if constexpr (!normalize) EVE_ASSERT(eve::all(kyosu::is_unitary(q)), "some quaternions are not unitary");
       using m_t = std::array< std::array<V, 3>, 3>;
       return m_t{{1, 0, 0}, {0, 1, 0}, {0, 0, 1}} ;