diff --git a/mozilla/mailnews/base/src/nsMsgStatusFeedback.cpp b/mozilla/mailnews/base/src/nsMsgStatusFeedback.cpp
index b5984528050..9a9a4a42e4b 100644
--- a/mozilla/mailnews/base/src/nsMsgStatusFeedback.cpp
+++ b/mozilla/mailnews/base/src/nsMsgStatusFeedback.cpp
@@ -79,6 +79,7 @@ NS_IMPL_THREADSAFE_RELEASE(nsMsgStatusFeedback);
 NS_INTERFACE_MAP_BEGIN(nsMsgStatusFeedback)
    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMsgStatusFeedback)
    NS_INTERFACE_MAP_ENTRY(nsIMsgStatusFeedback)
+   NS_INTERFACE_MAP_ENTRY(nsIProgressEventSink) 
    NS_INTERFACE_MAP_ENTRY(nsIWebProgressListener) 
 NS_INTERFACE_MAP_END