diff --git a/Include/auROXTL/ThirdParty/tartanllamaOptional.hpp b/Include/auROXTL/ThirdParty/tartanllamaOptional.hpp
index ef6a386..0f6a7e3 100644
--- a/Include/auROXTL/ThirdParty/tartanllamaOptional.hpp
+++ b/Include/auROXTL/ThirdParty/tartanllamaOptional.hpp
@@ -335,7 +335,7 @@ namespace tl {
             : std::is_void<invoke_result_t<F, U...>>
         { };
         template <class F, class... U>
-        using returns_void = returns_void_impl<F, void, U...>;
+        using returns_void = AuIsVoid<AuResultOf_t<F, U...>>; //  returns_void_impl<F, void, U...>;
 
         template <class T, class... U>
         using enable_if_ret_void = enable_if_t<returns_void<T &&, U...>::value>;