1 files changed, 1 insertions, 1 deletions
diff --git a/src/tac.c b/src/tac.c
index 69ec56f8b..ab929c642 100644
--- a/src/tac.c
+++ b/src/tac.c
@@ -641,7 +641,7 @@ main (int argc, char **argv)
 	case_GETOPT_HELP_CHAR;
 	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 	default:
-	  usage (1);
+	  usage (EXIT_FAILURE);
 	}
     }