diff --git a/test/common/tmpdir.js b/test/common/tmpdir.js
index a71f5e95155ab8..ca82e7bca0e7b3 100644
--- a/test/common/tmpdir.js
+++ b/test/common/tmpdir.js
@@ -5,6 +5,7 @@ const { execSync } = require('child_process');
 const fs = require('fs');
 const path = require('path');
 const { debuglog } = require('util');
+const { isMainThread } = require('worker_threads');
 
 const debug = debuglog('test/tmpdir');
 
@@ -110,7 +111,8 @@ function refresh(opts = {}) {
     process.on('exit', () => {
       try {
         // Change dit to avoid possible EBUSY
-        process.chdir(testRoot);
+        if (isMainThread)
+          process.chdir(testRoot);
         rimrafSync(tmpPath, { spawn: false });
       } catch (e) {
         console.error('Can\'t clean tmpdir:', tmpPath);
diff --git a/test/parallel/test-fs-truncate-fd.js b/test/parallel/test-fs-truncate-fd.js
index 057e4cb58df705..fbddbb32d5c0fc 100644
--- a/test/parallel/test-fs-truncate-fd.js
+++ b/test/parallel/test-fs-truncate-fd.js
@@ -21,7 +21,7 @@ fs.truncate(fd, 5, common.mustCall((err) => {
   assert.strictEqual(fs.readFileSync(filename, 'utf8'), 'hello');
 }));
 
-process.on('beforeExit', () => {
+process.once('beforeExit', () => {
   fs.closeSync(fd);
   fs.unlinkSync(filename);
   console.log('ok');