--- a/dom/events/EventStateManager.h
+++ b/dom/events/EventStateManager.h
@@ -21,17 +21,16 @@
 #define NS_USER_INTERACTION_INTERVAL 5000 // ms
 
 class nsFrameLoader;
 class nsIContent;
 class nsIDocument;
 class nsIDocShell;
 class nsIDocShellTreeItem;
 class imgIContainer;
-class EnterLeaveDispatcher;
 class nsIContentViewer;
 class nsIScrollableFrame;
 class nsITimer;
 class nsPresContext;
 
 namespace mozilla {
 
 class EnterLeaveDispatcher;