1 files changed, 1 insertions, 1 deletions
diff --git a/src/rm.c b/src/rm.c
index bae9e95b3..722994735 100644
--- a/src/rm.c
+++ b/src/rm.c
@@ -166,7 +166,7 @@ main (argc, argv)
 	usage (1);
     }
 
-  stdin_tty = isatty (0);
+  stdin_tty = isatty (STDIN_FILENO);
 
   for (; optind < argc; optind++)
     {