diff --git a/test/fixture/package.json b/test/fixture/package.json
index 7ad519d0..7622e81f 100644
--- a/test/fixture/package.json
+++ b/test/fixture/package.json
@@ -1,6 +1,7 @@
 {
   "name": "fixture",
   "private": "true",
+  "type": "module",
   "bin": {
     "fixture": "./bin/cli.mjs"
   },
diff --git a/test/fixture/src/index.ts b/test/fixture/src/index.mts
similarity index 100%
rename from test/fixture/src/index.ts
rename to test/fixture/src/index.mts