diff --git a/asio/include/asio/detail/task_io_service.hpp b/asio/include/asio/detail/task_io_service.hpp
index f4039d6..569c41a 100644
--- a/asio/include/asio/detail/task_io_service.hpp
+++ b/asio/include/asio/detail/task_io_service.hpp
@@ -23,6 +23,7 @@
 #include "asio/io_service.hpp"
 #include "asio/detail/atomic_count.hpp"
 #include "asio/detail/call_stack.hpp"
+#include "asio/detail/event.hpp"
 #include "asio/detail/mutex.hpp"
 #include "asio/detail/op_queue.hpp"
 #include "asio/detail/reactor_fwd.hpp"
diff --git a/asio/include/asio/detail/task_io_service_thread_info.hpp b/asio/include/asio/detail/task_io_service_thread_info.hpp
index 052406a..862c875 100644
--- a/asio/include/asio/detail/task_io_service_thread_info.hpp
+++ b/asio/include/asio/detail/task_io_service_thread_info.hpp
@@ -15,7 +15,6 @@
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
-#include "asio/detail/event.hpp"
 #include "asio/detail/op_queue.hpp"
 #include "asio/detail/thread_info_base.hpp"