diff --git a/mozilla/layout/base/public/Makefile.in b/mozilla/layout/base/public/Makefile.in
index b3be300cbee..22ab0eb7610 100644
--- a/mozilla/layout/base/public/Makefile.in
+++ b/mozilla/layout/base/public/Makefile.in
@@ -97,6 +97,7 @@ XPIDLSRCS	= \
 		nsISelectionController.idl  \
 		nsISelectionListener.idl  \
 		nsISelection.idl  \
+		nsISelectionPrivate.idl  \
 		nsIPrintListener.idl        \
 		$(NULL)