diff --git a/src/xz/message.c b/src/xz/message.c
index abf30adc..dec0addd 100644
--- a/src/xz/message.c
+++ b/src/xz/message.c
@@ -119,7 +119,7 @@ message_init(void)
 	// exception, even if --verbose was not used, user can send SIGALRM
 	// to make us print progress information once without automatic
 	// updating.
-	progress_automatic = isatty(STDERR_FILENO);
+	progress_automatic = is_tty(STDERR_FILENO);
 
 	// Commented out because COLUMNS is rarely exported to environment.
 	// Most users have at least 80 columns anyway, let's think something