diff --git a/tests/phpunit/LintUpdateTest.php b/tests/phpunit/LintUpdateTest.php
index 5fdbf53c..a6927528 100644
--- a/tests/phpunit/LintUpdateTest.php
+++ b/tests/phpunit/LintUpdateTest.php
@@ -190,7 +190,7 @@ class LintUpdateTest extends MediaWikiIntegrationTestCase {
 		$this->assertSame( 1, $hookCalled );
 	}
 
-	private function newRenderedRevision( WikiPage $page = null, RevisionRecord $rev = null ) {
+	private function newRenderedRevision( ?WikiPage $page = null, ?RevisionRecord $rev = null ) {
 		$page = $this->getExistingTestPage();
 		$title = $page->getTitle();