diff --git a/ghost/admin/app/components/gh-navitem-url-input.js b/ghost/admin/app/components/gh-navitem-url-input.js
index a72f6f886e..8473e13db0 100644
--- a/ghost/admin/app/components/gh-navitem-url-input.js
+++ b/ghost/admin/app/components/gh-navitem-url-input.js
@@ -131,7 +131,7 @@ export default TextField.extend(InvokeActionMixin, {
                 url = url.replace(baseUrlParts.pathname.slice(0, -1), '');
             }
 
-            if (url !== '') {
+            if (url !== '' || !this.get('isNew')) {
                 if (!url.match(/^\//)) {
                     url = `/${url}`;
                 }