diff --git a/typo3/sysext/fluid/Classes/ViewHelpers/Form/Select/OptgroupViewHelper.php b/typo3/sysext/fluid/Classes/ViewHelpers/Form/Select/OptgroupViewHelper.php
index be2ccffda586c38db884cff51cc68c533d218784..f5193027262eca1d9ae2f5038b6983f49695e760 100644
--- a/typo3/sysext/fluid/Classes/ViewHelpers/Form/Select/OptgroupViewHelper.php
+++ b/typo3/sysext/fluid/Classes/ViewHelpers/Form/Select/OptgroupViewHelper.php
@@ -46,7 +46,7 @@ class OptgroupViewHelper extends AbstractFormFieldViewHelper
     public function render()
     {
         if ($this->arguments['disabled']) {
-            $this->tag->addAttributes('disabled', 'disabled');
+            $this->tag->addAttribute('disabled', 'disabled');
         } else {
             $this->tag->removeAttribute('disabled');
         }