--- a/dom/media/ogg/OggDemuxer.cpp
+++ b/dom/media/ogg/OggDemuxer.cpp
@@ -1049,17 +1049,17 @@ OggDemuxer::FindStartTime(TrackInfo::Tra
 nsresult
 OggDemuxer::SeekInternal(TrackInfo::TrackType aType, const TimeUnit& aTarget)
 {
   int64_t target = aTarget.ToMicroseconds();
   OGG_DEBUG("About to seek to %" PRId64, target);
   nsresult res;
   int64_t adjustedTarget = target;
   int64_t startTime = StartTime(aType);
-  int64_t endTime = mInfo.mMetadataDuration->ToMicroseconds();
+  int64_t endTime = mInfo.mMetadataDuration->ToMicroseconds() + startTime;
   if (aType == TrackInfo::kAudioTrack && mOpusState){
     adjustedTarget = std::max(startTime, target - OGG_SEEK_OPUS_PREROLL);
   }
 
   if (!HaveStartTime(aType) || adjustedTarget == startTime) {
     // We've seeked to the media start or we can't seek.
     // Just seek to the offset of the first content page.
     res = Resource(aType)->Seek(nsISeekableStream::NS_SEEK_SET, 0);