diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index 9e7f7e6d8342..d0078367ae95 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -49,7 +49,7 @@
  * the POSIX standard; however, if the relevant sysconf() function
  * returns -1, the functions may be stubbed out.
  */
-#define	_POSIX_ADVISORY_INFO		-1
+#define	_POSIX_ADVISORY_INFO		200112L
 #define	_POSIX_ASYNCHRONOUS_IO		0
 #define	_POSIX_CHOWN_RESTRICTED		1
 #define	_POSIX_CLOCK_SELECTION		-1