diff --git a/src/Plugin/WebformHandler/WebformMailChimpHandler.php b/src/Plugin/WebformHandler/WebformMailChimpHandler.php
index 0c38089..8455a68 100644
--- a/src/Plugin/WebformHandler/WebformMailChimpHandler.php
+++ b/src/Plugin/WebformHandler/WebformMailChimpHandler.php
@@ -154,8 +154,8 @@ class WebformMailChimpHandler extends WebformHandlerBase {
       '#title' => $this->t('Interest groups'),
     ];
 
-    if ($form['list']['#default_value']) {
-      $list = mailchimp_get_list($form['list']['#default_value']);
+    if ($form['mailchimp']['list']['#default_value']) {
+      $list = mailchimp_get_list($form['mailchimp']['list']['#default_value']);
       if (!empty($list->intgroups)) {
         $groups_default = $this->configuration['interest_groups'];