diff --git a/package.json b/package.json
index a934ddc..e357c31 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "scripts": {
     "build": "tsc",
     "test": "npm run build && node scripts/run-tests.mjs",
-    "test:coverage": "npm run build && node --test --experimental-test-coverage --test-coverage-lines=98 --test-coverage-branches=93 --test-coverage-functions=97 test/*.test.js",
+    "test:coverage": "npm run build && node scripts/run-tests.mjs",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
diff --git a/test/run-tests-runner.test.js b/test/run-tests-runner.test.js
index 6f7cac7..9a24014 100644
--- a/test/run-tests-runner.test.js
+++ b/test/run-tests-runner.test.js
@@ -42,6 +42,12 @@ test('CONTRIBUTING.md documents the thresholds COVERAGE_FLAGS actually enforce',
   assert.match(doc, new RegExp(`lines ${pct('lines')}, branches ${pct('branches')}, functions ${pct('functions')}`));
 });
 
+test('test:coverage delegates to the shared runner without inline coverage flags', () => {
+  const { scripts } = JSON.parse(readFileSync(join(process.cwd(), 'package.json'), 'utf-8'));
+  assert.equal(scripts['test:coverage'], 'npm run build && node scripts/run-tests.mjs');
+  assert.doesNotMatch(scripts['test:coverage'], /--(?:experimental-test-coverage|test-coverage-)/);
+});
+
 test('listTestFiles returns only sorted *.test.js entries', () => {
   const dir = mkdtempSync(join(tmpdir(), 'pluk-run-tests-'));
   try {