diff --git a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
index 4133d42..1757a60 100644
--- a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
+++ b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
@@ -725,7 +725,7 @@ protected function buildXPathQuery($xpath, array $args = []) {
    *   Use $this->getSession()->getPage()->getContent() instead.
    */
   protected function getRawContent() {
-    @trigger_error('AssertLegacyTrait::getRawContent() is scheduled for removal in Drupal 9.0.0. Use $this->assertSession()->buildXPathQuery() instead.', E_USER_DEPRECATED);
+    @trigger_error('AssertLegacyTrait::getRawContent() is scheduled for removal in Drupal 9.0.0. Use $this->getSession()->getPage()->getContent() instead.', E_USER_DEPRECATED);
     return $this->getSession()->getPage()->getContent();
   }