diff --git a/test/stringize.cxx b/test/stringize.cxx
index fb22128..ebe559f 100644
--- a/test/stringize.cxx
+++ b/test/stringize.cxx
@@ -21,16 +21,21 @@
 
 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
 BEGIN sizeof(BOOST_PP_STRINGIZE(NDATA)) / sizeof(char) == 1 END
+# if defined __cplusplus
 BEGIN sizeof(BOOST_PP_WSTRINGIZE(NDATA)) / sizeof(wchar_t) == 1 END
 #endif
+#endif
 BEGIN sizeof(BOOST_PP_STRINGIZE(DATA)) / sizeof(char) == 5 END
 BEGIN sizeof(BOOST_PP_STRINGIZE(FDATA(1))) / sizeof(char) == 2 END
 BEGIN sizeof(BOOST_PP_STRINGIZE(FDATA(9))) / sizeof(char) == 3 END
+# if defined __cplusplus
 BEGIN sizeof(BOOST_PP_WSTRINGIZE(DATA)) / sizeof(wchar_t) == 5 END
 BEGIN sizeof(BOOST_PP_WSTRINGIZE(FDATA(1))) / sizeof(wchar_t) == 2 END
 BEGIN sizeof(BOOST_PP_WSTRINGIZE(FDATA(9))) / sizeof(wchar_t) == 3 END
-
+#endif
 #if BOOST_PP_VARIADICS
 BEGIN sizeof(BOOST_PP_STRINGIZE(VDATA)) / sizeof(char) == 8 END
+# if defined __cplusplus
 BEGIN sizeof(BOOST_PP_WSTRINGIZE(VDATA)) / sizeof(wchar_t) == 8 END
 #endif
+#endif