diff --git a/components/script/dom/webidls/MediaMetadata.webidl b/components/script/dom/webidls/MediaMetadata.webidl
index b4142e431ae..495aeef8e35 100644
--- a/components/script/dom/webidls/MediaMetadata.webidl
+++ b/components/script/dom/webidls/MediaMetadata.webidl
@@ -12,9 +12,9 @@ dictionary MediaImage {
   DOMString type = "";
 };
 
-[Exposed=Window,
- Constructor(optional MediaMetadataInit init = {})]
+[Exposed=Window]
 interface MediaMetadata {
+  [Throws] constructor(optional MediaMetadataInit init = {});
   attribute DOMString title;
   attribute DOMString artist;
   attribute DOMString album;