diff --git a/libmpdemux/demux_ts.c b/libmpdemux/demux_ts.c
index 40890b915b..aa6176b09c 100644
--- a/libmpdemux/demux_ts.c
+++ b/libmpdemux/demux_ts.c
@@ -570,6 +570,8 @@ static off_t ts_detect_streams(demuxer_t *demuxer, tsdemux_init_t *param)
 			if((es.type == PES_PRIVATE1) && (! audio_found))
 			{
 				pptr = &pes_priv1[es.pid];
+				if(pptr->pos < 64*1024)
+				{
 				tmpbuf = (char*) realloc(pptr->buf, pptr->pos + es.size);
 				if(tmpbuf != NULL)
 				{
@@ -583,6 +585,7 @@ static off_t ts_detect_streams(demuxer_t *demuxer, tsdemux_init_t *param)
 						es.type = AUDIO_A52;
 					}
 				}
+				}
 			}
 			
 			is_audio = IS_AUDIO(es.type) || ((es.type==SL_PES_STREAM) && IS_AUDIO(es.subtype));