diff --git a/content/media/MediaSegment.h b/content/media/MediaSegment.h
index e04d54d55e3..f3b5ed7b9d2 100644
--- a/content/media/MediaSegment.h
+++ b/content/media/MediaSegment.h
@@ -40,6 +40,11 @@ inline double MediaTimeToSeconds(MediaTime aTime)
   return aTime*(1.0/(1 << MEDIA_TIME_FRAC_BITS));
 }
 
+inline int64_t MediaTimeToMicroseconds(MediaTime aTime)
+{
+  return aTime*(1000000.0/(1 << MEDIA_TIME_FRAC_BITS));
+}
+
 /**
  * A number of ticks at a rate determined by some underlying track (e.g.
  * audio sample rate). We want to make sure that multiplying TrackTicks by