diff --git a/src/main.rs b/src/main.rs
index 32f5602..8ad8ffe 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -132,7 +132,9 @@ async fn login(
             let s = Uuid::new_v4();
             let mut locked = state.session.lock().await;
             locked.insert(s.clone(), Instant::now() + Duration::from_secs(SESSION_ACTIVE_TIME));
-            cookies.add(Cookie::new(COOKIE_NAME, s.to_string()));
+            let mut new_cookie = Cookie::new(COOKIE_NAME, s.to_string());
+            new_cookie.set_domain(".aaronhu.cn");
+            cookies.add(new_cookie);
             if let Some(original_uri) = params.get("original_url") {
                 return Ok(Redirect::to(&original_uri));
             }