diff --git a/packages/vitest/src/runtime/entry.ts b/packages/vitest/src/runtime/entry.ts
index cad96f36d89d..93a526963e9a 100644
--- a/packages/vitest/src/runtime/entry.ts
+++ b/packages/vitest/src/runtime/entry.ts
@@ -17,7 +17,10 @@ export async function run(files: string[], config: ResolvedConfig): Promise<void
     __vitest_worker__.filepath = file
 
     await withEnv(env as BuiltinEnvironment, config.environmentOptions || {}, async() => {
+      const cacheProcess = process
       await startTests([file], config)
+      // eslint-disable-next-line no-global-assign
+      process = cacheProcess
     })
 
     __vitest_worker__.filepath = undefined
diff --git a/test/core/test/basic.test.ts b/test/core/test/basic.test.ts
index b646ce3220e4..dcc726b00286 100644
--- a/test/core/test/basic.test.ts
+++ b/test/core/test/basic.test.ts
@@ -2,6 +2,12 @@ import { assert, expect, it, suite, test } from 'vitest'
 import { two } from '../src/submodule'
 import { timeout } from '../src/timeout'
 
+test('mess process', () => {
+  // eslint-disable-next-line no-global-assign
+  process = 1 as any
+  expect(process).toBe(1)
+})
+
 test('Math.sqrt()', async() => {
   assert.equal(Math.sqrt(4), two)
   assert.equal(Math.sqrt(2), Math.SQRT2)