diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index 3f8e163467..59fc6f29da 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -398,6 +398,8 @@ void av_packet_move_ref(AVPacket *dst, AVPacket *src)
 {
     *dst = *src;
     av_init_packet(src);
+    src->data = NULL;
+    src->size = 0;
 }
 
 void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)