diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index d4ab49f119..5fca1a89a6 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -1646,6 +1646,9 @@ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadF
         /* Accept the 64k local set limit being exceeded (Avid). Don't accept
          * it extending past the end of the KLV though (zzuf5.mxf). */
         if (avio_tell(pb) > klv_end) {
+            if (ctx_size)
+                av_free(ctx);
+
             av_log(mxf->fc, AV_LOG_ERROR,
                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",
                    tag, klv->offset);