diff --git a/internal/push/push_to_client.go b/internal/push/push_to_client.go
index ba0d65b39..8f671c21d 100644
--- a/internal/push/push_to_client.go
+++ b/internal/push/push_to_client.go
@@ -222,7 +222,7 @@ func (p *Pusher) Push2SuperGroup(ctx context.Context, groupID string, msg *sdkws
 				// log.ZError(ctx, "GetRecvMsgNotNotifyUserIDs failed", err, "groupID", groupID)
 				return err
 			}
-			needOfflinePushUserIDs = utils.DifferenceString(notNotificationUserIDs, needOfflinePushUserIDs)
+			needOfflinePushUserIDs = utils.SliceSub(needOfflinePushUserIDs, notNotificationUserIDs)
 		}
 		// Use offline push messaging
 		if len(needOfflinePushUserIDs) > 0 {