diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 6713f2a9bd..38624dd6e6 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -836,6 +836,8 @@ static int mux_write_packet(AVFormatContext *s, AVPacket *pkt)
     klv_encode_ber_length(pb, pkt->size); // write length
     put_buffer(pb, pkt->data, pkt->size); // write value
 
+    sc->duration = FFMAX(pkt->pts + pkt->duration, sc->duration);
+
     put_flush_packet(pb);
     return 0;
 }