diff --git a/package.json b/package.json
index e0954ca..4d18c90 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "scripts": {
     "check": "npm-run-all --parallel check:*",
     "check:lint": "eslint --no-eslintrc --config=.eslintrc.json **/*.{js,mjs}",
-    "check:prettier": "prettier --check **/*.{js,json,md}",
+    "check:prettier": "prettier --check **/*.{js,json,md,mjs}",
     "ci": "npm-run-all check test",
     "postinstall": "lerna bootstrap",
     "test": "lerna run test"
diff --git a/packages/check-es-compat/bin/cli.mjs b/packages/check-es-compat/bin/cli.mjs
index f4c0b55..928780f 100644
--- a/packages/check-es-compat/bin/cli.mjs
+++ b/packages/check-es-compat/bin/cli.mjs
@@ -19,9 +19,10 @@ if (args.length === 0) {
 
 async function execute(files) {
   const eslint = new ESLint({
-    // Ignore any config files
+    // Ignore any config; it's for target's own linter setup rather than this tool.
     useEslintrc: false,
     ignore: false,
+    allowInlineConfig: false,
 
     baseConfig: {
       plugins: ['ecmascript-compat'],