diff --git a/dom/events/EventNameList.h b/dom/events/EventNameList.h
index 9f8506c9a661..677e7c6fae2a 100644
--- a/dom/events/EventNameList.h
+++ b/dom/events/EventNameList.h
@@ -163,8 +163,7 @@ EVENT(close, eClose, EventNameType_HTMLXUL, eBasicEventClass)
 EVENT(contextmenu, eContextMenu, EventNameType_HTMLXUL, eMouseEventClass)
 NON_IDL_EVENT(mouselongtap, eMouseLongTap, EventNameType_HTMLXUL,
               eMouseEventClass)
-// Not supported yet
-// EVENT(cuechange)
+EVENT(cuechange, eCueChange, EventNameType_All, eBasicEventClass)
 EVENT(dblclick, eMouseDoubleClick, EventNameType_HTMLXUL, eMouseEventClass)
 EVENT(drag, eDrag, EventNameType_HTMLXUL, eDragEventClass)
 EVENT(dragend, eDragEnd, EventNameType_HTMLXUL, eDragEventClass)
diff --git a/dom/webidl/EventHandler.webidl b/dom/webidl/EventHandler.webidl
index 4589d153f5d8..19febd5eabe5 100644
--- a/dom/webidl/EventHandler.webidl
+++ b/dom/webidl/EventHandler.webidl
@@ -38,7 +38,7 @@ interface GlobalEventHandlers {
            attribute EventHandler onclick;
            attribute EventHandler onclose;
            attribute EventHandler oncontextmenu;
-           //(Not implemented)attribute EventHandler oncuechange;
+           attribute EventHandler oncuechange;
            attribute EventHandler ondblclick;
            attribute EventHandler ondrag;
            attribute EventHandler ondragend;
diff --git a/widget/EventMessageList.h b/widget/EventMessageList.h
index 3cb86a30ab4d..7c4b221f4a61 100644
--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -108,6 +108,8 @@ NS_EVENT_MESSAGE_FIRST_LAST(ePointerEvent, ePointerMove, ePointerLostCapture)
 
 NS_EVENT_MESSAGE(eContextMenu)
 
+NS_EVENT_MESSAGE(eCueChange)
+
 NS_EVENT_MESSAGE(eLoad)
 NS_EVENT_MESSAGE(eUnload)
 NS_EVENT_MESSAGE(eHashChange)