diff --git a/titan.c b/titan.c
index 62733b9..d9736c1 100644
--- a/titan.c
+++ b/titan.c
@@ -269,7 +269,7 @@ main(int argc, char **argv)
 	if (cert != NULL && key == NULL)
 		key = cert;
 
-	if (argc > 2)
+	if (argc != 1 && argc != 2)
 		usage();
 
 	in = open_input_file(argc, argv);