diff --git a/test/additional-modules/my-es-module/package.json b/test/additional-modules/my-es-module/package.json
index fbd4420..31b4500 100644
--- a/test/additional-modules/my-es-module/package.json
+++ b/test/additional-modules/my-es-module/package.json
@@ -1,5 +1,6 @@
 {
     "main": "index.js",
+    "type": "module",
     "exports": {
         ".": {
           "default": {