diff --git a/libavformat/rtmppkt.c b/libavformat/rtmppkt.c
index cbd09f23be03e45c7818966f7b5ae38df15aee5d..65d5dd9d5704b625cfc24e7213bd229c95588c46 100644
--- a/libavformat/rtmppkt.c
+++ b/libavformat/rtmppkt.c
@@ -273,6 +273,7 @@ static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
        prev->data = p->data;
        prev->read = p->read;
        prev->offset = p->offset;
+       p->data      = NULL;
        return AVERROR(EAGAIN);
     }