diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index 472bad9b6a..74b76e2501 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -85,7 +85,7 @@ static int mp3_read_probe(AVProbeData *p)
     else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;
     else if(max_frames>=4) return AVPROBE_SCORE_EXTENSION / 2;
     else if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC) && 2*ff_id3v2_tag_len(buf0) >= p->buf_size)
-                           return AVPROBE_SCORE_EXTENSION / 4;
+                           return p->buf_size < PROBE_BUF_MAX ? AVPROBE_SCORE_EXTENSION / 4 : AVPROBE_SCORE_EXTENSION - 2;
     else if(max_frames>=1) return 1;
     else                   return 0;
 //mpegps_mp3_unrecognized_format.mpg has max_frames=3