diff --git a/packages/ui-default/pages/problem_detail.page.tsx b/packages/ui-default/pages/problem_detail.page.tsx
index 6c32dc599..c08a03424 100644
--- a/packages/ui-default/pages/problem_detail.page.tsx
+++ b/packages/ui-default/pages/problem_detail.page.tsx
@@ -297,7 +297,7 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
 
     if (cnt) {
       await loadAns();
-      $('.problem-content .typo').append(!document.getElementsByClassName('nav__item--round').length
+      $('.problem-content .typo').append(document.getElementsByClassName('nav__item--round').length
         ? `<input type="submit" disabled class="button rounded primary disabled" value="${i18n('Login to Submit')}" />`
         : `<input type="submit" class="button rounded primary" value="${i18n('Submit')}" />`);
       $('.objective-input[type!=checkbox]').on('input', (e: JQuery.TriggeredEvent<HTMLInputElement>) => {