diff --git a/widget/EventMessageList.h b/widget/EventMessageList.h
index 63a6e3bae438..a676e608d321 100644
--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -292,7 +292,6 @@ NS_EVENT_MESSAGE(NS_SIMPLE_GESTURE_EDGE_COMPLETED, NS_SIMPLE_GESTURE_EVENT_START
 // These are used to send native events to plugins.
 NS_EVENT_MESSAGE(NS_PLUGIN_EVENT_START, 3600)
 NS_EVENT_MESSAGE(NS_PLUGIN_INPUT_EVENT, NS_PLUGIN_EVENT_START)
-NS_EVENT_MESSAGE(NS_PLUGIN_FOCUS_EVENT, NS_PLUGIN_EVENT_START + 1)
 
 // Events to manipulate selection (WidgetSelectionEvent)
 NS_EVENT_MESSAGE(NS_SELECTION_EVENT_START, 3700)