diff --git a/include/boost/cstdint.hpp b/include/boost/cstdint.hpp
index e7799742..5e1411a5 100644
--- a/include/boost/cstdint.hpp
+++ b/include/boost/cstdint.hpp
@@ -369,7 +369,7 @@ namespace boost
 
 #if (defined(BOOST_WINDOWS) && !defined(_WIN32_WCE)) \
     || (defined(_XOPEN_UNIX) && (_XOPEN_UNIX+0 > 0) && !defined(__UCLIBC__)) \
-    || defined(__CYGWIN__) \
+    || defined(__CYGWIN__) || defined(__VXWORKS__) \
     || defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__) \
     || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || (defined(sun) && !defined(BOOST_HAS_STDINT_H)) || defined(INTPTR_MAX)