diff --git a/dom/media/mediasource/TrackBuffer.cpp b/dom/media/mediasource/TrackBuffer.cpp
index 73a4030e1f9..670572cd332 100644
--- a/dom/media/mediasource/TrackBuffer.cpp
+++ b/dom/media/mediasource/TrackBuffer.cpp
@@ -196,6 +196,7 @@ TrackBuffer::AppendDataToCurrentResource(const uint8_t* aData, uint32_t aLength)
   // XXX: For future reference: NDA call must run on the main thread.
   mCurrentDecoder->NotifyDataArrived(reinterpret_cast<const char*>(aData),
                                      aLength, appendOffset);
+  mParentDecoder->NotifyBytesDownloaded();
   mParentDecoder->NotifyTimeRangesChanged();
 
   return true;