1 files changed, 1 insertions, 1 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 5da975746..0a32099c7 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -2825,7 +2825,7 @@ int hush_main(int argc, char **argv)
          *    standard output is a terminal
          *    Refer to Posix.2, the description of the `sh' utility. */
         if (argv[optind]==NULL && input==stdin &&
-                        isatty(fileno(stdin)) && isatty(fileno(stdout))) {
+                        isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
                 interactive++;
         }