diff --git a/lib/dash/mpd_processor.js b/lib/dash/mpd_processor.js
index 8fe06c38db..83c5f7feed 100644
--- a/lib/dash/mpd_processor.js
+++ b/lib/dash/mpd_processor.js
@@ -1064,6 +1064,7 @@ shaka.dash.MpdProcessor.prototype.makeSegmentIndexSourceViaSegmentTemplate_ =
   }
 
   shaka.asserts.unreachable();
+  return null;
 };