diff --git a/include/boost/unordered/detail/extract_key.hpp b/include/boost/unordered/detail/extract_key.hpp
index 969cd6ae..fd3141f0 100644
--- a/include/boost/unordered/detail/extract_key.hpp
+++ b/include/boost/unordered/detail/extract_key.hpp
@@ -138,7 +138,7 @@ namespace detail {
 #define BOOST_UNORDERED_KEY_FROM_TUPLE(namespace_)                          \
         template <typename T2>                                              \
         static no_key extract(boost::unordered::piecewise_construct_t,      \
-                namespace_ tuple<> const&, BOOST_FWD_REF(T2))               \
+                namespace_ tuple<> const&, T2 const&)                       \
         {                                                                   \
             return no_key();                                                \
         }                                                                   \
@@ -146,7 +146,7 @@ namespace detail {
         template <typename T, typename T2>                                  \
         static typename is_key<key_type, T>::type                           \
             extract(boost::unordered::piecewise_construct_t,                \
-                namespace_ tuple<T> const& k, BOOST_FWD_REF(T2))            \
+                namespace_ tuple<T> const& k, T2 const&)                    \
         {                                                                   \
             return typename is_key<key_type, T>::type(                      \
                 namespace_ get<0>(k));                                      \
diff --git a/test/unordered/insert_tests.cpp b/test/unordered/insert_tests.cpp
index a789bf01..9fc75580 100644
--- a/test/unordered/insert_tests.cpp
+++ b/test/unordered/insert_tests.cpp
@@ -698,6 +698,12 @@ derived_from_piecewise_construct_t piecewise_rvalue() {
     return derived_from_piecewise_construct_t();
 }
 
+struct convertible_to_piecewise {
+    operator boost::unordered::piecewise_construct_t() const {
+        return boost::unordered::piecewise_construct;
+    }
+};
+
 UNORDERED_AUTO_TEST(map_emplace_test2)
 {
     boost::unordered_map<overloaded_constructor, overloaded_constructor> x;
@@ -706,7 +712,7 @@ UNORDERED_AUTO_TEST(map_emplace_test2)
     BOOST_TEST(x.find(overloaded_constructor()) != x.end() &&
         x.find(overloaded_constructor())->second == overloaded_constructor());
 
-    x.emplace(boost::unordered::piecewise_construct, boost::make_tuple(1), boost::make_tuple());
+    x.emplace(convertible_to_piecewise(), boost::make_tuple(1), boost::make_tuple());
     BOOST_TEST(x.find(overloaded_constructor(1)) != x.end() &&
         x.find(overloaded_constructor(1))->second == overloaded_constructor());