--- a/test/cpp/nnp_test.h
+++ b/test/cpp/nnp_test.h
@@ -7,6 +7,7 @@
 #include <boost/process.hpp>
 #include <boost/filesystem.hpp>
 #include <iostream>
+#include <boost/asio.hpp>
 #include "fileHelpers.h"
 
 namespace bdata = boost::unit_test::data;