diff --git a/core/modules/config/lib/Drupal/config/Form/ConfigSync.php b/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
index 889799a..8e95d7e 100644
--- a/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
+++ b/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
@@ -160,7 +160,7 @@ public function buildForm(array $form, array &$form_state) {
       $form['actions']['#access'] = FALSE;
       return $form;
     }
-    elseif (!$config_comparer->validateSiteUuid()) {
+    elseif (!$storage_comparer->validateSiteUuid()) {
       drupal_set_message($this->t('The staged configuration cannot be imported, because it originates from a different site than this site. You can only synchronize configuration between cloned instances of this site.'), 'error');
       $form['actions']['#access'] = FALSE;
       return $form;