--- a/dom/media/MediaDevices.cpp
+++ b/dom/media/MediaDevices.cpp
@@ -23,17 +23,17 @@ class MediaDevices::GumResolver : public
 public:
   NS_DECL_ISUPPORTS
 
   explicit GumResolver(Promise* aPromise) : mPromise(aPromise) {}
 
   NS_IMETHOD
   OnSuccess(nsISupports* aStream) override
   {
-    RefPtr<DOMLocalMediaStream> stream = do_QueryObject(aStream);
+    RefPtr<DOMMediaStream> stream = do_QueryObject(aStream);
     if (!stream) {
       return NS_ERROR_FAILURE;
     }
     mPromise->MaybeResolve(stream);
     return NS_OK;
   }
 
 private: