diff --git a/src/hooks/install.test.ts b/src/hooks/install.test.ts
index 5c0cabc141b..5930de2c2b7 100644
--- a/src/hooks/install.test.ts
+++ b/src/hooks/install.test.ts
@@ -2,7 +2,7 @@ import { randomUUID } from "node:crypto";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
-import { afterAll, beforeEach, describe, expect, it, vi } from "vitest";
+import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
 import { expectSingleNpmPackIgnoreScriptsCall } from "../test-utils/exec-assertions.js";
 import {
   expectInstallUsesIgnoreScripts,
@@ -29,7 +29,6 @@ vi.mock("../process/exec.js", () => ({
 }));
 
 function makeTempDir() {
-  fs.mkdirSync(fixtureRoot, { recursive: true });
   const dir = path.join(fixtureRoot, `case-${tempDirIndex++}`);
   fs.mkdirSync(dir, { recursive: true });
   return dir;
@@ -51,6 +50,10 @@ beforeEach(() => {
   vi.clearAllMocks();
 });
 
+beforeAll(() => {
+  fs.mkdirSync(fixtureRoot, { recursive: true });
+});
+
 function writeArchiveFixture(params: { fileName: string; contents: Buffer }) {
   const stateDir = makeTempDir();
   const workDir = makeTempDir();