diff --git a/libavformat/tee.c b/libavformat/tee.c
index af52a490c6..821d23d407 100644
--- a/libavformat/tee.c
+++ b/libavformat/tee.c
@@ -424,6 +424,8 @@ static int filter_packet(void *log_ctx, AVPacket *pkt,
         }
 
         if (ret > 0) {
+            pkt->side_data = NULL;
+            pkt->side_data_elems = 0;
             av_packet_unref(pkt);
             new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
                                            av_buffer_default_free, NULL, 0);