diff --git a/worker/staff.go b/worker/staff.go
index c90d6fd..dabdf2a 100644
--- a/worker/staff.go
+++ b/worker/staff.go
@@ -274,6 +274,9 @@ func (s *Staff) getRealWorkDay(username, month string) float64 {
 		if strings.Contains(checkin.Exception, "上班打卡:时间异常") {
 			stTime := time.Unix(checkin.StartTime, 0)
 			later := float64(stTime.Hour() - 8) //迟到小时数，从9点算
+			if later > 8 {
+				later = 8
+			}
 			realWorkdays += (8 - later) / 8
 			continue
 		}