diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index f5215b0163..de78b781d4 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -791,6 +791,9 @@ static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size
     partition->index_sid = avio_rb32(pb);
     partition->body_offset = avio_rb64(pb);
     partition->body_sid = avio_rb32(pb);
+    if (partition->body_offset < 0)
+        return AVERROR_INVALIDDATA;
+
     if (avio_read(pb, op, sizeof(UID)) != sizeof(UID)) {
         av_log(mxf->fc, AV_LOG_ERROR, "Failed reading UID\n");
         return AVERROR_INVALIDDATA;