diff --git a/tests/phpunit/structure/PerformanceBudgetTest.php b/tests/phpunit/structure/PerformanceBudgetTest.php
index 3500372e7..c34ae0a83 100644
--- a/tests/phpunit/structure/PerformanceBudgetTest.php
+++ b/tests/phpunit/structure/PerformanceBudgetTest.php
@@ -142,6 +142,8 @@ class PerformanceBudgetTest extends MediaWikiIntegrationTestCase {
 	 * @throws MediaWiki\Config\ConfigException
 	 */
 	public function testTotalModulesSize( $skinName, $maxSizes ) {
+		$this->markTestSkipped( 'test unstable: T350338' );
+
 		$skin = $this->prepareSkin( $skinName );
 		$moduleStyles = $skin->getOutput()->getModuleStyles();
 		$size = 0;