Index: boost/thread/future.hpp
===================================================================
--- boost/thread/future.hpp	(revision 75662)
+++ boost/thread/future.hpp	(working copy)
@@ -322,7 +322,7 @@
             void mark_finished_with_result(rvalue_source_type result_)
             {
                 boost::lock_guard<boost::mutex> lock(mutex);
-                mark_finished_with_result_internal(result_);
+                mark_finished_with_result_internal(static_cast<rvalue_source_type>(result_));
             }
 
             move_dest_type get()