diff --git a/mailchimp.module b/mailchimp.module
index 122211c..b9e4d5a 100644
--- a/mailchimp.module
+++ b/mailchimp.module
@@ -1158,7 +1158,7 @@ function mailchimp_insert_drupal_form_tag($mergevar) {
     '#default_value' => $mergevar->default_value,
   );
 
-  $input['#title'] = t($mergevar->name);
+  $input['#title'] = t((string) $mergevar->name);
 
   switch ($mergevar->type) {
     case 'address':