diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index 0a8a58247fcd..987f6c84bc03 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -2300,6 +2300,7 @@ void HTMLMediaElement::AbortExistingLoads() {
     }
     ChangeNetworkState(NETWORK_EMPTY);
     RemoveMediaTracks();
+    UpdateOutputTrackSources();
     ChangeReadyState(HAVE_NOTHING);
 
     // TODO: Apply the rules for text track cue rendering Bug 865407