diff --git a/include/boost/unordered/detail/type_traits.hpp b/include/boost/unordered/detail/type_traits.hpp
index 3fe2f404..fd37a8e4 100644
--- a/include/boost/unordered/detail/type_traits.hpp
+++ b/include/boost/unordered/detail/type_traits.hpp
@@ -53,10 +53,10 @@ namespace boost {
       {
       };
 
-      template <class, class A, class B> struct are_transparent
+      template <class, class Hash, class KeyEqual> struct are_transparent
       {
         static bool const value =
-          is_transparent<A>::value && is_transparent<B>::value;
+          is_transparent<Hash>::value && is_transparent<KeyEqual>::value;
       };
 
       template <class Key, class UnorderedMap> struct transparent_non_iterable