diff --git a/include/boost/hana/core/to.hpp b/include/boost/hana/core/to.hpp
index 7100ad5f5..7b46e01fb 100644
--- a/include/boost/hana/core/to.hpp
+++ b/include/boost/hana/core/to.hpp
@@ -49,8 +49,8 @@ namespace boost { namespace hana {
         };
 
         template <typename To, typename From>
-        struct maybe_static_cast<To, From, decltype((void)
-            static_cast<To>(std::declval<From>())
+        struct maybe_static_cast<To, From, decltype(
+            std::declval<void(&)(To)>()(std::declval<From>())
         )> {
             template <typename X>
             static constexpr To apply(X&& x)
@@ -63,6 +63,13 @@ namespace boost { namespace hana {
         : convert_detail::maybe_static_cast<To, From>
     { };
 
+    template <typename To, typename From>
+    struct to_impl<To, From, when<std::is_void<To>::value>> {
+        template <typename X>
+        static constexpr X apply(X&&)
+        { return; }
+    };
+
     template <typename To>
     struct to_impl<To, To> : embedding<> {
         template <typename X>