diff --git a/mailnews/base/util/nsMsgDBFolder.h b/mailnews/base/util/nsMsgDBFolder.h
index c821aa77c3c..8f03ae602d6 100644
--- a/mailnews/base/util/nsMsgDBFolder.h
+++ b/mailnews/base/util/nsMsgDBFolder.h
@@ -106,6 +106,7 @@ protected:
 
   static nsIAtom* mFolderLoadedAtom;
   static nsIAtom* mDeleteOrMoveMsgCompletedAtom;
+  static nsIAtom* mDeleteOrMoveMsgFailedAtom;
 
 private:
   static nsrefcnt mInstanceCount;