diff --git a/mozilla/mailnews/compose/public/nsIDOMComposeAppCore.h b/mozilla/mailnews/compose/public/nsIDOMComposeAppCore.h
index 39baf087e4a..8377e265a4f 100644
--- a/mozilla/mailnews/compose/public/nsIDOMComposeAppCore.h
+++ b/mozilla/mailnews/compose/public/nsIDOMComposeAppCore.h
@@ -34,6 +34,9 @@ class nsIDOMComposeAppCore : public nsIDOMBaseAppCore {
  public: 
   NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDOMCOMPOSEAPPCORE_IID)
 
+  /* void Dispose (); */
+  NS_IMETHOD Dispose() = 0;
+
   /* void SetWindow (in nsIDOMWindow ptr); */
   NS_IMETHOD SetWindow(nsIDOMWindow *ptr) = 0;