diff --git a/include/boost/cstdint.hpp b/include/boost/cstdint.hpp
index d685672c..b0714779 100644
--- a/include/boost/cstdint.hpp
+++ b/include/boost/cstdint.hpp
@@ -140,7 +140,7 @@ namespace boost
 
 } // namespace boost
 
-#elif defined(__FreeBSD__) && (__FreeBSD__ <= 4) || defined(__osf__) || defined(__VMS)
+#elif defined(__FreeBSD__) && (__FreeBSD__ <= 4) || defined(__osf__) || defined(__VMS) || defined(__SOLARIS9__) || defined(__NetBSD__)
 // FreeBSD and Tru64 have an <inttypes.h> that contains much of what we need.
 # include <inttypes.h>