diff --git a/ffmpeg.c b/ffmpeg.c
index eb3f613400..5575e2f9a4 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -372,7 +372,7 @@ void term_init(void)
         struct termios tty;
         int istty = 1;
 #if HAVE_ISATTY
-        istty = isatty(0);
+        istty = isatty(0) && isatty(2);
 #endif
         if (istty && tcgetattr (0, &tty) == 0) {
             oldtty = tty;