--- a/dom/media/webaudio/MediaBufferDecoder.cpp
+++ b/dom/media/webaudio/MediaBufferDecoder.cpp
@@ -594,18 +594,17 @@ WebAudioDecodeJob::OnFailure(ErrorCode a
                                   NS_LITERAL_CSTRING("Media"),
                                   doc,
                                   nsContentUtils::eDOM_PROPERTIES,
                                   errorMessage);
 
   // Ignore errors in calling the callback, since there is not much that we can
   // do about it here.
   if (mFailureCallback) {
-    ErrorResult rv;
-    mFailureCallback->Call(rv);
+    mFailureCallback->Call();
   }
 
   mPromise->MaybeReject(NS_ERROR_DOM_ENCODING_NOT_SUPPORTED_ERR);
 
   mContext->RemoveFromDecodeQueue(this);
 }
 
 size_t