diff --git a/sys/contrib/zstd/programs/platform.h b/sys/contrib/zstd/programs/platform.h
--- a/sys/contrib/zstd/programs/platform.h
+++ b/sys/contrib/zstd/programs/platform.h
@@ -75,10 +75,11 @@
 #ifndef PLATFORM_POSIX_VERSION
 
 #  if (defined(__APPLE__) && defined(__MACH__)) || defined(__SVR4) || defined(_AIX) || defined(__hpux) /* POSIX.1-2001 (SUSv3) conformant */ \
-     || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)  /* BSD distros */
      /* exception rule : force posix version to 200112L,
       * note: it's better to use unistd.h's _POSIX_VERSION whenever possible */
 #    define PLATFORM_POSIX_VERSION 200112L
+#  elif defined(__FreeBSD__)
+#    define PLATFORM_POSIX_VERSION 200809L
 
 /* try to determine posix version through official unistd.h's _POSIX_VERSION (http://pubs.opengroup.org/onlinepubs/7908799/xsh/unistd.h.html).
  * note : there is no simple way to know in advance if <unistd.h> is present or not on target system,