--- a/pr/include/md/_unixos.h
+++ b/pr/include/md/_unixos.h
@@ -22,17 +22,17 @@
 /*
  * If FD_SETSIZE is not defined on the command line, set the default value
  * before include select.h
  */
 /*
  * Linux: FD_SETSIZE is defined in /usr/include/sys/select.h and should
  * not be redefined.
  */
-#if !defined(LINUX)
+#if !defined(LINUX) && !defined(RHAPSODY)
 #ifndef FD_SETSIZE
 #define FD_SETSIZE  4096
 #endif
 #endif
 
 #include <unistd.h>
 #include <stddef.h>
 #include <sys/stat.h>