diff --git a/tests/phpunit/Integration/ResourcesTest.php b/tests/phpunit/Integration/ResourcesTest.php
index 8f1e68a6..93e523ba 100644
--- a/tests/phpunit/Integration/ResourcesTest.php
+++ b/tests/phpunit/Integration/ResourcesTest.php
@@ -2,7 +2,6 @@
 
 namespace SRF\Tests\Integration;
 
-use MediaWiki\MediaWikiServices;
 use ResourceLoader;
 use ResourceLoaderContext;
 
@@ -34,7 +33,13 @@ private function getSRFResourceModules() {
 	}
 
 	public function moduleDataProvider() {
-		$resourceLoader = MediaWikiServices::getInstance()->getResourceLoader();
+		// #501
+		// MW 1.33+
+		if ( class_exists( '\MediaWiki\MediaWikiServices' ) && method_exists( '\MediaWiki\MediaWikiServices', 'getResourceLoader' ) ) {
+			$resourceLoader = \MediaWiki\MediaWikiServices::getInstance()->getResourceLoader();
+		} else {
+			$resourceLoader = new ResourceLoader();
+		}
 
 		$context = ResourceLoaderContext::newDummyContext();
 		$modules = $this->getSRFResourceModules();