diff --git a/xpcom/public/nsXPComCIID.h b/xpcom/public/nsXPComCIID.h
new file mode 100644
index 000000000000..11b34a8d6777
--- /dev/null
+++ b/xpcom/public/nsXPComCIID.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 2; 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
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#ifndef nsXPComCIID_h__
+#define nsXPComCIID_h__
+
+/*
+ * Below are the CLSIDs of the components which are available via the xpcom
+ * factory. 
+ */
+
+/* be761f00-a3b0-11d2-996c-0080c7cb1080 */
+#define NS_EVENTQUEUESERVICE_CID \
+{ 0xbe761f00, 0xa3b0, 0x11d2, \
+  {0x99, 0x6c, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80} }
+
+
+#endif /* nsXPComCIID_h__ */