diff --git a/include/boost/asio/detail/impl/epoll_reactor.ipp b/include/boost/asio/detail/impl/epoll_reactor.ipp
index 27408e4e..68552be3 100644
--- a/include/boost/asio/detail/impl/epoll_reactor.ipp
+++ b/include/boost/asio/detail/impl/epoll_reactor.ipp
@@ -600,8 +600,14 @@ struct epoll_reactor::perform_io_cleanup_on_block_exit
   operation* first_op_;
 };
 
-epoll_reactor::descriptor_state::descriptor_state()
-  : operation(&epoll_reactor::descriptor_state::do_complete)
+epoll_reactor::descriptor_state::descriptor_state() :
+operation(&epoll_reactor::descriptor_state::do_complete),
+next_(),
+prev_(),
+reactor_(),
+descriptor_(),
+registered_events_(),
+shutdown_()
 {
 }