diff --git a/include/boost/fiber/future/detail/task_object.hpp b/include/boost/fiber/future/detail/task_object.hpp
index 88678bf0..9a2cf516 100644
--- a/include/boost/fiber/future/detail/task_object.hpp
+++ b/include/boost/fiber/future/detail/task_object.hpp
@@ -35,6 +35,12 @@ public:
         task_object
     >                                           allocator_t;
 
+    task_object( allocator_t const& alloc, Fn const& fn) :
+        base_t(),
+        fn_( fn),
+        alloc_( alloc) {
+    }
+
     task_object( allocator_t const& alloc, Fn && fn) :
         base_t(),
         fn_( std::move( fn) ),
@@ -89,6 +95,12 @@ public:
         task_object< Fn, Allocator, void, Args ... >
     >::other                                      allocator_t;
 
+    task_object( allocator_t const& alloc, Fn const& fn) :
+        base_t(),
+        fn_( fn),
+        alloc_( alloc) {
+    }
+
     task_object( allocator_t const& alloc, Fn && fn) :
         base_t(),
         fn_( std::move( fn) ),