diff --git a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
index ebd4850e56248a29f337a0960593379292cff5ed..6ca9f850a23523b46992d19b7f888f4c52b7c15f 100644
--- a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
+++ b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
@@ -420,7 +420,7 @@ abstract public function assertSession($name = NULL);
    * @deprecated Scheduled for removal in Drupal 9.0.0.
    *   Use $this->assertSession()->buildXPathQuery() instead.
    */
-  public function buildXPathQuery($xpath, array $args = array()) {
+  protected function buildXPathQuery($xpath, array $args = array()) {
     return $this->assertSession()->buildXPathQuery($xpath, $args);
   }