diff --git a/e2e/theme.spec.js b/e2e/theme.spec.js
index 1c0715a45..9fbb10f68 100644
--- a/e2e/theme.spec.js
+++ b/e2e/theme.spec.js
@@ -107,6 +107,15 @@ test("public profile page theme selector works without authentication", async ({
   // Clear cookies so visitor is unauthenticated
   await page.context().clearCookies();
 
+  // OVERRIDE: Mock the session endpoint to return an unauthenticated state
+  // This prevents the authenticated mock from beforeEach from leaking into this test.
+  await page.route("**/api/auth/session**", async (route) => {
+    await route.fulfill({
+      contentType: "application/json",
+      body: JSON.stringify({}), // NextAuth interprets an empty object (or null) as unauthenticated
+    });
+  });
+
   // Navigate to any public profile URL — will show "Profile Not Found"
   // but the full layout (including ThemeToggle) still renders
   await page.goto("/u/no-such-user-for-e2e-test", { waitUntil: "load" });