diff --git a/libavformat/mp3.c b/libavformat/mp3.c
index c80b5d44f5848c2f616de71e59993d3a424cca00..93d4be063b5366e2f26c6f30de72b5acfc67a13b 100644
--- a/libavformat/mp3.c
+++ b/libavformat/mp3.c
@@ -60,7 +60,7 @@ static int mp3_read_probe(AVProbeData *p)
         if(buf == buf0)
             first_frames= frames;
     }
-    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
+    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
     else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
     else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
     else if(buf0!=p->buf)  return AVPROBE_SCORE_MAX/4-1;