diff --git a/include/boost/config/platform/cygwin.hpp b/include/boost/config/platform/cygwin.hpp
index 41fcaa10..5627dd60 100644
--- a/include/boost/config/platform/cygwin.hpp
+++ b/include/boost/config/platform/cygwin.hpp
@@ -8,9 +8,6 @@
 //  cygwin specific config options:
 
 #define BOOST_PLATFORM "Cygwin"
-#define BOOST_NO_CWCTYPE
-#define BOOST_NO_CWCHAR
-#define BOOST_NO_SWPRINTF
 #define BOOST_HAS_DIRENT_H
 #define BOOST_HAS_LOG1P
 #define BOOST_HAS_EXPM1