diff --git a/src/fake-timers-src.js b/src/fake-timers-src.js
index 607336d6a9c568a32b0cde4499c8fd56f06d424a..35187b0ee298df858118494b5a9b3e5efa8197b0 100644
--- a/src/fake-timers-src.js
+++ b/src/fake-timers-src.js
@@ -2,9 +2,9 @@
 
 const globalObject = require("@sinonjs/commons").global;
 let timersModule;
-if (typeof require === "function" && typeof module === "object") {
+if (typeof __vitest_required__ !== 'undefined') {
     try {
-        timersModule = require("timers");
+        timersModule = __vitest_required__.timers;
     } catch (e) {
         // ignored
     }
@@ -159,7 +159,7 @@ function withGlobal(_global) {
         hrtimePresent && typeof _global.process.hrtime.bigint === "function";
     const nextTickPresent =
         _global.process && typeof _global.process.nextTick === "function";
-    const utilPromisify = _global.process && require("util").promisify;
+    const utilPromisify = _global.process && _global.__vitest_required__ && _global.__vitest_required__.util.promisify;
     const performancePresent =
         _global.performance && typeof _global.performance.now === "function";
     const hasPerformancePrototype =