diff --git a/asyncmsg/Server.h b/asyncmsg/Server.h
index 6be4ea1a1647655cb0e638f157865c15327fe82b..1170d169ef094cc0b9b65066d8d539c8188c4ca3 100644
--- a/asyncmsg/Server.h
+++ b/asyncmsg/Server.h
@@ -1,6 +1,7 @@
 #ifndef ASYNCMSG_SERVER_H
 #define ASYNCMSG_SERVER_H
 
+#include <boost/asio/io_service.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/strand.hpp>
 #include <atomic>
diff --git a/asyncmsg/Session.h b/asyncmsg/Session.h
index 0de6987ea8a995385a624c58cf0bd295809a24bc..4f4e89d507f6c9368833548ffaba62b1a1823fd4 100644
--- a/asyncmsg/Session.h
+++ b/asyncmsg/Session.h
@@ -4,6 +4,7 @@
 #include "asyncmsg/detail/Header.h"
 #include "asyncmsg/Message.h"
 
+#include <boost/asio/io_service.hpp>
 #include <boost/asio/buffer.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/strand.hpp>
diff --git a/asyncmsg/UDPSession.h b/asyncmsg/UDPSession.h
index 20100a775e982ebfacac921ef08628f23de2914a..edecb55ec79fad1d701d73f6e8b54d8c54cdd272 100644
--- a/asyncmsg/UDPSession.h
+++ b/asyncmsg/UDPSession.h
@@ -5,6 +5,7 @@
 #include "asyncmsg/detail/Header.h"
 #include "asyncmsg/Message.h"
 
+#include <boost/asio/io_service.hpp>
 #include <boost/asio/buffer.hpp>
 #include <boost/asio/ip/udp.hpp>
 #include <boost/asio/strand.hpp>