diff --git a/libavformat/flac_picture.c b/libavformat/flac_picture.c
index a58b3055c8..5f2026d1d0 100644
--- a/libavformat/flac_picture.c
+++ b/libavformat/flac_picture.c
@@ -110,6 +110,7 @@ int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
     if (!(data = av_buffer_alloc(len + FF_INPUT_BUFFER_PADDING_SIZE))) {
         RETURN_ERROR(AVERROR(ENOMEM));
     }
+    memset(data->data + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
     if (avio_read(pb, data->data, len) != len) {
         av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
         if (s->error_recognition & AV_EF_EXPLODE)