diff --git a/ui/frontend/tests/pwa/pwa.spec.ts b/ui/frontend/tests/pwa/pwa.spec.ts
index aaf7fa6..d24e35b 100644
--- a/ui/frontend/tests/pwa/pwa.spec.ts
+++ b/ui/frontend/tests/pwa/pwa.spec.ts
@@ -18,7 +18,10 @@ test.describe("PWA", () => {
 			.get(href!)
 			.then((r) => r.json());
 		expect(manifest.name).toBe("Galaxy");
-		expect(manifest.start_url).toBe("/");
+		// Relative so the manifest is base-agnostic: served under the app
+		// base (`/` at the root, `/game/` in the single-origin deploy) it
+		// resolves to the app root either way.
+		expect(manifest.start_url).toBe("./");
 		expect(manifest.display).toBe("standalone");
 		const sizes = (manifest.icons as { sizes: string }[]).map((i) => i.sizes);
 		expect(sizes).toContain("192x192");