diff --git a/libavformat/oggparseogm.c b/libavformat/oggparseogm.c
index e7a501b5a7..fad093b629 100644
--- a/libavformat/oggparseogm.c
+++ b/libavformat/oggparseogm.c
@@ -110,6 +110,7 @@ ogm_header(AVFormatContext *s, int idx)
                 size -= 52;
                 if (bytestream2_get_bytes_left(&p) < size)
                     return AVERROR_INVALIDDATA;
+                av_freep(&st->codecpar->extradata);
                 if (ff_alloc_extradata(st->codecpar, size) < 0)
                     return AVERROR(ENOMEM);
                 bytestream2_get_buffer(&p, st->codecpar->extradata, st->codecpar->extradata_size);