diff --git a/components/script/dom/webidls/EventSource.webidl b/components/script/dom/webidls/EventSource.webidl
index b9cf82d6a3e..11c30e959d4 100644
--- a/components/script/dom/webidls/EventSource.webidl
+++ b/components/script/dom/webidls/EventSource.webidl
@@ -7,8 +7,7 @@
  */
 
 [Constructor(DOMString url, optional EventSourceInit eventSourceInitDict),
- Exposed=(Window,Worker),
- Pref="dom.eventsource.enabled"]
+ Exposed=(Window,Worker)]
 interface EventSource : EventTarget {
   readonly attribute DOMString url;
   readonly attribute boolean withCredentials;