diff --git a/tests/phpunit/MediaWikiIntegrationTestCase.php b/tests/phpunit/MediaWikiIntegrationTestCase.php
index e805c1b8250..e7df5c9c782 100644
--- a/tests/phpunit/MediaWikiIntegrationTestCase.php
+++ b/tests/phpunit/MediaWikiIntegrationTestCase.php
@@ -92,6 +92,8 @@ abstract class MediaWikiIntegrationTestCase extends PHPUnit\Framework\TestCase {
 	 *
 	 * @var Database|null
 	 * @since 1.18
+	 * @deprecated since 1.43. Use MediaWikiIntegrationTestCase->getDb() instead. This will
+	 * eventually be made private.
 	 */
 	protected $db;