diff --git a/backend/templates/index.html.template b/backend/templates/index.html.template
index 0e4513f..01f143a 100644
--- a/backend/templates/index.html.template
+++ b/backend/templates/index.html.template
@@ -60,7 +60,7 @@
     <h1>Shorten URL</h1>
 <form method="post">
       <label for="url">URL to shorten:</label>
-      <input type="url" name="url" placeholder="https://example.com" value="{{url}}">
+      <input type="url" name="url" placeholder="https://example.com" required value="{{url}}">
       <input type="submit" value="Shorten!">
     </form>
     {{shorturl}}