diff --git a/src/tools/oggz-validate.c b/src/tools/oggz-validate.c
index c69f98582281ab826fda5d7ffcbb07cdeb6a33ad..39b6f6afe4a5ef38d663c69016386a2a41d1b23b 100644
--- a/src/tools/oggz-validate.c
+++ b/src/tools/oggz-validate.c
@@ -342,7 +342,7 @@ read_packet (OGGZ * oggz, ogg_packet * op, long serialno, void * user_data)
   int ret = 0, feed_err = 0, i;
 
   timestamp = gp_to_time (oggz, serialno, op->granulepos);
-  if (timestamp != -1.0) {
+  if (timestamp != -1.0 && oggz_stream_get_content (oggz, serialno) != OGGZ_CONTENT_DIRAC) {
     if (timestamp < current_timestamp) {
       ret = log_error();
       ot_fprint_time (stderr, (double)timestamp/SUBSECONDS);