diff --git a/js/script.js b/js/script.js
index 1a5c63c..ab84331 100644
--- a/js/script.js
+++ b/js/script.js
@@ -92,8 +92,9 @@ $('body').on('keyup keypress', '.js-authn-otp-code', function (e) {
   // }
   if ($(this).val().length === 14) {
     $('.submit-btn').prop('disabled', false);
+  } else {
+    $('.submit-btn').prop('disabled', true);
   }
-
 });
 
 $('.js-authn-otp-code').mask('####-####-####');