diff --git a/public/index.php b/public/index.php
index 2c11f2a..5b64efb 100644
--- a/public/index.php
+++ b/public/index.php
@@ -237,7 +237,7 @@ if (isset($_GET["backgroundcolor"]) && !empty($_GET["backgroundcolor"]) && preg_
                             ?>
                         </div>
                     </div>
-                    <?php /* Hide this box if we're embedded in another page */ if (!defined($_GET["embed"])) { ?>
+                    <?php /* Hide this box if we're embedded in another page */ if (!isset($_GET["embed"])) { ?>
                         <div class="card-body">
                             <p>
                                 Look up another machine: