diff --git a/mozilla/layout/base/public/MANIFEST_IDL b/mozilla/layout/base/public/MANIFEST_IDL
index 1f32069e70b..690837bd46f 100644
--- a/mozilla/layout/base/public/MANIFEST_IDL
+++ b/mozilla/layout/base/public/MANIFEST_IDL
@@ -4,4 +4,6 @@
 
 nsIChromeEventHandler.idl
 nsISelectionController.idl
+nsISelection.idl
+nsISelectionPrivate.idl
 nsIContentPolicy.idl