diff --git a/panopoly_magic.module b/panopoly_magic.module
index 23486af..c539adf 100644
--- a/panopoly_magic.module
+++ b/panopoly_magic.module
@@ -296,10 +296,10 @@ function panopoly_magic_form_alter(&$form, &$form_state, $form_id) {
 
       // Autosubmit the form
       ctools_add_js('auto-submit');
-      $form['#attributes']['class'][] = 'ctools-auto-submit-full-form';
+      $form['#attributes']['class'] = 'ctools-auto-submit-full-form';
     }
   }
-  
+
    /**
    * Globally improve the buttons for the Chaos Tools Content Type Settings Forms
    */