diff --git a/globalbackfeedmanager.go b/globalbackfeedmanager.go
index d7d39f5..6c9f14e 100644
--- a/globalbackfeedmanager.go
+++ b/globalbackfeedmanager.go
@@ -281,6 +281,7 @@ func (that *GlobalBackfeedManager) HandleUnlink(res http.ResponseWriter, req *ht
 		return
 	}
 	pipe := that.BackfeedRedis.Pipeline()
+	pipe.HDel(req.Context(), ":last_ts", keys...)
 	for _, key := range keys {
 		pipe.Unlink(req.Context(), key)
 	}