diff --git a/react-router.config.ts b/react-router.config.ts
index 25f009d..72bf7a4 100644
--- a/react-router.config.ts
+++ b/react-router.config.ts
@@ -4,5 +4,5 @@ export default {
   // Server-side rendering is enabled by default.
   // Disable it because we have a separate backend server
   ssr: false,
-  basename: "/project2",
+  basename: "/project2/",
 } satisfies Config;
diff --git a/vite.config.ts b/vite.config.ts
index 2f11994..f3cfb8e 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -3,6 +3,8 @@ import { defineConfig } from "vitest/config";
 
 // https://vite.dev/config/
 export default defineConfig({
+  // Must match `basename` in react-router.config.ts.
+  base: "/project2/",
   // React Router does not work in Vitest's environment.
   // See GitHub discussion: https://github.com/remix-run/react-router/discussions/12655
   plugins: [!process.env.VITEST && reactRouter()],