diff --git a/tests/test_db_pg.py b/tests/test_db_pg.py
index 01b9d88..32117d6 100644
--- a/tests/test_db_pg.py
+++ b/tests/test_db_pg.py
@@ -141,6 +141,6 @@ async def test_memory_from_days_ago(conn):
     await db.add_message(s, "user", "半个月前的话")
     rows = await db.memory_from_days_ago(s, 15, time.time())
     assert rows == []  # 刚插入的不在 15 天前
-    # days=0 的窗口是 [now_ts, now_ts+86400]，now_ts 用现在即可罩住刚插入的
-    rows = await db.memory_from_days_ago(s, 0, time.time())
+    # days=1 的窗口是 [now-86400, now]，正好罩住刚插入的消息
+    rows = await db.memory_from_days_ago(s, 1, time.time())
     assert any(r["content"] == "半个月前的话" for r in rows)