diff --git a/packages/browser/src/node/serverTester.ts b/packages/browser/src/node/serverTester.ts
index 4e658da8e90c..b5b1fb68f18f 100644
--- a/packages/browser/src/node/serverTester.ts
+++ b/packages/browser/src/node/serverTester.ts
@@ -55,7 +55,7 @@ export async function resolveTester(
     const testerScripts = await server.formatScripts(
       project.config.browser.testerScripts,
     )
-    const clientScript = `<script type="module" src="${server.project.config.base || '/'}@vite/client"></script>`
+    const clientScript = `<script type="module" src="${server.base}@vite/client"></script>`
     const stateJs = typeof server.stateJs === 'string'
       ? server.stateJs
       : await server.stateJs