diff --git a/core/modules/simpletest/src/AssertContentTrait.php b/core/modules/simpletest/src/AssertContentTrait.php
index a35ae10..9c545c4 100644
--- a/core/modules/simpletest/src/AssertContentTrait.php
+++ b/core/modules/simpletest/src/AssertContentTrait.php
@@ -1375,7 +1375,7 @@ protected function assertOptionSelectedWithDrupalSelector($drupal_selector, $opt
    *   TRUE on pass, FALSE on fail.
    */
   protected function assertNoOptionSelected($drupal_selector, $option, $message = '', $group = 'Browser') {
-    $elements = $this->xpath('//select[@drupal_selector=:drupal_selector]//option[@value=:option]', array(':drupal_selector' => $drupal_selector, ':option' => $option));
+    $elements = $this->xpath('//select[@data-drupal-selector=:data_drupal_selector]//option[@value=:option]', array(':data_drupal_selector' => $drupal_selector, ':option' => $option));
     return $this->assertTrue(isset($elements[0]) && empty($elements[0]['selected']), $message ? $message : SafeMarkup::format('Option @option for field @drupal_selector is not selected.', array('@option' => $option, '@drupal_selector' => $drupal_selector)), $group);
   }