diff --git a/include/boost/asio/detail/win_thread.hpp b/include/boost/asio/detail/win_thread.hpp
index 123ced72..fe95b3fb 100644
--- a/include/boost/asio/detail/win_thread.hpp
+++ b/include/boost/asio/detail/win_thread.hpp
@@ -80,6 +80,11 @@ public:
         boost::throw_exception(e);
       }
     }
+    else
+    {
+      arg->entry_event_ = 0;
+      arg->exit_event_ = 0;
+    }
 
     unsigned int thread_id = 0;
     thread_ = reinterpret_cast<HANDLE>(::_beginthreadex(0, 0,