diff --git a/modules/setup/application/forms/AuthBackendPage.php b/modules/setup/application/forms/AuthBackendPage.php
index a8f702805..d73a82dcd 100644
--- a/modules/setup/application/forms/AuthBackendPage.php
+++ b/modules/setup/application/forms/AuthBackendPage.php
@@ -204,7 +204,7 @@ class AuthBackendPage extends Form
             }
 
             $this->info($this->translate('The configuration has been successfully validated.'));
-        } elseif (isset($formData['btn_discover_domains'])) {
+        } elseif (isset($formData['btn_discover_domain'])) {
             return parent::isValidPartial($formData);
         } elseif (! isset($formData['backend_validation'])) {
             // This is usually done by isValid(Partial), but as we're not calling any of these...