diff --git a/mozilla/mailnews/news/public/nsIMsgNewsgroup.idl b/mozilla/mailnews/news/public/nsIMsgNewsgroup.idl
index bad6c96abac..9e8eb2b95be 100644
--- a/mozilla/mailnews/news/public/nsIMsgNewsgroup.idl
+++ b/mozilla/mailnews/news/public/nsIMsgNewsgroup.idl
@@ -1,4 +1,4 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in
diff --git a/mozilla/mailnews/news/public/nsIMsgOfflineNewsState.idl b/mozilla/mailnews/news/public/nsIMsgOfflineNewsState.idl
index 3f6d2b2fa54..be7318bc2cb 100644
--- a/mozilla/mailnews/news/public/nsIMsgOfflineNewsState.idl
+++ b/mozilla/mailnews/news/public/nsIMsgOfflineNewsState.idl
@@ -1,4 +1,4 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in
diff --git a/mozilla/mailnews/news/public/nsINNTPArticleList.idl b/mozilla/mailnews/news/public/nsINNTPArticleList.idl
index c456087e17e..c1edab5d491 100644
--- a/mozilla/mailnews/news/public/nsINNTPArticleList.idl
+++ b/mozilla/mailnews/news/public/nsINNTPArticleList.idl
@@ -1,4 +1,4 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in
diff --git a/mozilla/mailnews/news/public/nsINNTPHost.idl b/mozilla/mailnews/news/public/nsINNTPHost.idl
index 0dea1d257f0..7b07c34d471 100644
--- a/mozilla/mailnews/news/public/nsINNTPHost.idl
+++ b/mozilla/mailnews/news/public/nsINNTPHost.idl
@@ -1,4 +1,4 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in
diff --git a/mozilla/mailnews/news/public/nsINNTPNewsgroupList.idl b/mozilla/mailnews/news/public/nsINNTPNewsgroupList.idl
index 06ed225a785..ae13b7e48be 100644
--- a/mozilla/mailnews/news/public/nsINNTPNewsgroupList.idl
+++ b/mozilla/mailnews/news/public/nsINNTPNewsgroupList.idl
@@ -1,4 +1,4 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in