diff --git a/include/boost/config/stdlib/modena.hpp b/include/boost/config/stdlib/modena.hpp
index 51ea321f..8d68cee5 100644
--- a/include/boost/config/stdlib/modena.hpp
+++ b/include/boost/config/stdlib/modena.hpp
@@ -18,6 +18,10 @@
 #define BOOST_NO_STD_MESSAGES
 #endif
 
+#ifndef MSIPL_WCHART
+#define BOOST_NO_STD_WSTRING
+#endif
+
 #define BOOST_STDLIB "Modena C++ standard library"