--- IO-AIO/AIO.xs	2017/06/23 21:43:51	1.246
+++ IO-AIO/AIO.xs	2017/06/23 22:09:50	1.247
@@ -926,7 +926,6 @@
     const_niv (MADV_RANDOM    , POSIX_MADV_RANDOM)
     const_niv (MADV_WILLNEED  , POSIX_MADV_WILLNEED)
     const_niv (MADV_DONTNEED  , POSIX_MADV_DONTNEED)
-    const_niv (MADV_FREE      , POSIX_MADV_FREE)
 
     /* the second block will be 0 when missing */
     const_iv (O_RDONLY)