--- IO-AIO/AIO.xs	2016/05/01 17:19:39	1.241
+++ IO-AIO/AIO.xs	2016/07/12 20:46:33	1.242
@@ -925,6 +925,7 @@
     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)