diff --git a/client/ptt.go b/client/ptt.go
index 6ea82280..3521b9aa 100644
--- a/client/ptt.go
+++ b/client/ptt.go
@@ -156,7 +156,7 @@ func (c *QQClient) UploadShortVideo(target message.Source, video, thumb io.ReadS
 		cmd = 89
 	}
 	ext, _ := proto.Marshal(c.buildPttShortVideoProto(target, videoSum, thumbSum, videoLen, thumbLen).PttShortVideoUploadReq)
-	combined := utils.MultiReadSeeker(thumb, video)
+	combined := io.MultiReader(thumb, video)
 	input := highway.Transaction{
 		CommandID: cmd,
 		Body:      combined,
diff --git a/utils/sys.go b/utils/sys.go
index cdd8b69b..b3b11654 100644
--- a/utils/sys.go
+++ b/utils/sys.go
@@ -23,7 +23,7 @@ func (r *multiReadSeeker) Read(p []byte) (int, error) {
 		readers := make([]io.Reader, len(r.readers))
 		for i := range r.readers {
 			_, _ = r.readers[i].Seek(0, io.SeekStart)
-			readers = append(readers, r.readers[i])
+			readers[i] = r.readers[i]
 		}
 		r.multiReader = io.MultiReader(readers...)
 	}