diff --git a/packages/astro/test/lit-element.test.js b/packages/astro/test/lit-element.test.js
index 395eaf2e52ac..8c333bca2422 100644
--- a/packages/astro/test/lit-element.test.js
+++ b/packages/astro/test/lit-element.test.js
@@ -18,6 +18,9 @@ describe('LitElement test', function () {
 		fixture = await loadFixture({
 			projectRoot: './fixtures/lit-element/',
 			renderers: ['@astrojs/renderer-lit'],
+			buildOptions: {
+				legacyBuild: true
+			}
 		});
 		await fixture.build();
 	});