diff --git a/test/std_interop_test.cpp b/test/std_interop_test.cpp
index 8264a69..44a97b9 100644
--- a/test/std_interop_test.cpp
+++ b/test/std_interop_test.cpp
@@ -12,6 +12,7 @@
 # define _CRT_SECURE_NO_WARNINGS
 
 #include <boost/config.hpp>
+#include <iostream>
 
 #if defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR)