diff --git a/programs/fileio.c b/programs/fileio.c
index 7ec4114b..90d04d7f 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -57,21 +57,11 @@
 #  include <lz4.h>
 #endif
 
-// Multi-OS support for determining if terminal is tty
-#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) ||     \
-    defined(__CYGWIN__)
-#include <io.h> /* _isatty */
-#include <sys/stat.h>
-#define IS_CONSOLE(stdStream) _isatty(_fileno(stdStream))
-#elif defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || defined(_POSIX_SOURCE) || (defined(__APPLE__) && defined(__MACH__)) || \
-      defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)  /* https://sourceforge.net/p/predef/wiki/OperatingSystems/ */
-#include <unistd.h> /* isatty */
-#define IS_CONSOLE(stdStream) isatty(fileno(stdStream))
-#else
-#define IS_CONSOLE(stdStream) 0
+#if defined (_MSC_VER)
+#  include <sys/stat.h>
+#  include <io.h>
 #endif
 
-
 /*-*************************************
 *  Constants
 ***************************************/