diff --git a/include/boost/config.hpp b/include/boost/config.hpp
index 055a2785..f37585eb 100644
--- a/include/boost/config.hpp
+++ b/include/boost/config.hpp
@@ -36,7 +36,7 @@
 #endif
 
 // if we don't have a std library config set, try and find one:
-#if !defined(BOOST_STDLIB_CONFIG) && !defined(BOOST_NO_STDLIB_CONFIG) && !defined(BOOST_NO_CONFIG)
+#if !defined(BOOST_STDLIB_CONFIG) && !defined(BOOST_NO_STDLIB_CONFIG) && !defined(BOOST_NO_CONFIG) && defined(__cplusplus)
 #  include <boost/config/select_stdlib_config.hpp>
 #endif
 // if we have a std library config, include it now: