diff --git a/libavformat/flac_picture.c b/libavformat/flac_picture.c
index 20df0192d4..c9f3f11edd 100644
--- a/libavformat/flac_picture.c
+++ b/libavformat/flac_picture.c
@@ -89,7 +89,7 @@ int ff_flac_parse_picture(AVFormatContext *s, uint8_t **bufp, int buf_size,
         mime++;
     }
     if (id == AV_CODEC_ID_NONE) {
-        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
+        av_log(s, AV_LOG_WARNING, "Unknown attached picture mimetype: %s.\n",
                mimetype);
         return 0;
     }