diff --git a/libagnos/cpp/src/utils.hpp b/libagnos/cpp/src/utils.hpp
index 9a9d827..4216a57 100644
--- a/libagnos/cpp/src/utils.hpp
+++ b/libagnos/cpp/src/utils.hpp
@@ -25,6 +25,7 @@
 #include <iterator>
 #include "utf8.h"
 
+#include <boost/asio.hpp>
 #include <boost/thread/thread.hpp>
 #include <boost/thread/mutex.hpp>
 #include "objtypes.hpp"