diff --git a/libavformat/mp3.c b/libavformat/mp3.c
index ec8c0bb997a2ff89047c429535e6db16708e8bb4..eca9ad4240040337864309f3561672481ee5ec2d 100644
--- a/libavformat/mp3.c
+++ b/libavformat/mp3.c
@@ -364,7 +364,7 @@ static int mp3_read_probe(AVProbeData *p)
 
     max_frames = 0;
     buf = buf0;
-    end = buf + p->buf_size - sizeof(uint32_t);
+    end = p->buf + p->buf_size - sizeof(uint32_t);
 
     for(; buf < end; buf= buf2+1) {
         buf2 = buf;