diff --git a/packages/astro/test/fixtures/hoisted-imports/astro.config.js b/packages/astro/test/fixtures/hoisted-imports/astro.config.mjs
similarity index 100%
rename from packages/astro/test/fixtures/hoisted-imports/astro.config.js
rename to packages/astro/test/fixtures/hoisted-imports/astro.config.mjs
diff --git a/packages/astro/test/fixtures/virtual-routes/astro.config.js b/packages/astro/test/fixtures/virtual-routes/astro.config.mjs
similarity index 100%
rename from packages/astro/test/fixtures/virtual-routes/astro.config.js
rename to packages/astro/test/fixtures/virtual-routes/astro.config.mjs