diff --git a/include/boost/system/config.hpp b/include/boost/system/config.hpp
index 728bd81..51e104c 100644
--- a/include/boost/system/config.hpp
+++ b/include/boost/system/config.hpp
@@ -32,7 +32,7 @@
 
 #if !defined(BOOST_SYSTEM_DYN_LINK) && !defined(BOOST_SYSTEM_STATIC_LINK) \
   && !defined(BOOST_ALL_DYN_LINK) && !defined(BOOST_ALL_STATIC_LINK)
-# error Must define BOOST_ALL_DYN_LINK, BOOST_ALL_DYN_LINK, BOOST_SYSTEM_DYN_LINK, or BOOST_SYSTEM_STATIC_LINK
+# define BOOST_SYSTEM_DYN_LINK
 #endif
 
 #if defined(BOOST_ALL_DYN_LINK) && !defined(BOOST_SYSTEM_DYN_LINK)