diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 8630403423..b6eda6c63e 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -1372,6 +1372,8 @@ static int mxf_write_footer(AVFormatContext *s)
 
     ff_audio_interleave_close(s);
 
+    av_freep(&mxf->index_entries);
+
     mxf_free(s);
     return 0;
 }