--- a/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
+++ b/dom/media/platforms/wmf/WMFMediaDataDecoder.cpp
@@ -60,17 +60,20 @@ SendTelemetry(unsigned long hr)
   } else {
     sample = 3; // high bucket
   }
 
   nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
     [sample] {
       Telemetry::Accumulate(Telemetry::MEDIA_WMF_DECODE_ERROR, sample);
     });
-  NS_DispatchToMainThread(runnable);
+
+  SystemGroup::Dispatch("WMFMediaDataDecoder::SendTelemetry",
+                        TaskCategory::Other,
+                        runnable.forget());
 }
 
 RefPtr<ShutdownPromise>
 WMFMediaDataDecoder::Shutdown()
 {
   MOZ_DIAGNOSTIC_ASSERT(!mIsShutDown);
 
   mIsShutDown = true;