diff --git a/dom/media/mediasource/MediaSourceDecoder.cpp b/dom/media/mediasource/MediaSourceDecoder.cpp
index 085483bff97e..39c30b7464e3 100644
--- a/dom/media/mediasource/MediaSourceDecoder.cpp
+++ b/dom/media/mediasource/MediaSourceDecoder.cpp
@@ -66,8 +66,7 @@ MediaSourceDecoder::Load(nsIStreamListener**, MediaDecoder*)
   NS_ENSURE_SUCCESS(rv, rv);
 
   SetStateMachineParameters();
-
-  return NS_OK;
+  return ScheduleStateMachineThread();
 }
 
 nsresult