diff --git a/include/boost/fiber/future/async.hpp b/include/boost/fiber/future/async.hpp
index b6792a8d..13f3d025 100644
--- a/include/boost/fiber/future/async.hpp
+++ b/include/boost/fiber/future/async.hpp
@@ -21,24 +21,22 @@ namespace boost {
 namespace fibers {
 
 template< typename Fn, typename ... Args >
-future< typename std::result_of< Fn &&( Args && ... ) >::type >
+future< typename std::result_of< Fn( Args && ... ) >::type >
 async( Fn && fn, Args && ... args) {
-    typedef typename std::result_of< Fn &&( Args && ... ) >::type result_type;
+    typedef typename std::result_of< Fn( Args && ... ) >::type result_type;
 
-    packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
-            std::forward< Fn >( fn) };
+    packaged_task< result_type( Args && ... ) > pt{ std::forward< Fn >( fn) };
     future< result_type > f{ pt.get_future() };
     fiber{ std::move( pt), std::forward< Args >( args) ... }.detach();
     return f;
 }
 
 template< typename StackAllocator, typename Fn, typename ... Args >
-future< typename std::result_of< Fn &&( Args && ... ) >::type >
+future< typename std::result_of< Fn( Args && ... ) >::type >
 async( std::allocator_arg_t, StackAllocator salloc, Fn && fn, Args && ... args) {
-    typedef typename std::result_of< Fn &&( Args && ... ) >::type result_type;
+    typedef typename std::result_of< Fn( Args && ... ) >::type result_type;
 
-    packaged_task< result_type( typename std::decay< Args >::type ... ) > pt{
-            std::forward< Fn >( fn) };
+    packaged_task< result_type( Args && ... ) > pt{ std::forward< Fn >( fn) };
     future< result_type > f{ pt.get_future() };
     fiber{ salloc, std::move( pt), std::forward< Args >( args) ... }.detach();
     return f;