diff --git a/plugins/sign_in/group_user_checkin.py b/plugins/sign_in/group_user_checkin.py
index c7b5f746..91683c2c 100644
--- a/plugins/sign_in/group_user_checkin.py
+++ b/plugins/sign_in/group_user_checkin.py
@@ -42,7 +42,7 @@ async def _handle_check_in(
     nickname: str, user_qq: int, group: int, present: datetime
 ) -> MessageSegment:
     user = await SignGroupUser.ensure(user_qq, group, for_update=True)
-    impression_added = (secrets.randbelow(90)+1)/100
+    impression_added = (secrets.randbelow(99)+1)/100
     critx2 = random.random()
     add_probability = user.add_probability
     specify_probability = user.specify_probability