diff --git a/code/addons/test/src/postinstall.ts b/code/addons/test/src/postinstall.ts
index cac46c5fa619..c7c6331bed00 100644
--- a/code/addons/test/src/postinstall.ts
+++ b/code/addons/test/src/postinstall.ts
@@ -407,6 +407,8 @@ export default async function postInstall(options: PostinstallOptions) {
     // If there's an existing config, we create a workspace file so we can run Storybook tests alongside.
     const extension = extname(rootConfig);
     const browserWorkspaceFile = resolve(dirname(rootConfig), `vitest.workspace${extension}`);
+    // to be set in vitest config
+    const vitestSetupFilePath = relative(dirname(browserWorkspaceFile), vitestSetupFile);
 
     logger.line(1);
     logger.plain(`${step} Creating a Vitest project workspace file:`);
@@ -442,7 +444,7 @@ export default async function postInstall(options: PostinstallOptions) {
                 name: 'chromium',
                 provider: 'playwright',
               },
-              setupFiles: ['./.storybook/vitest.setup.ts'],
+              setupFiles: ['${vitestSetupFilePath}'],
             },
           },
         ]);