diff --git a/mozilla/configure.in b/mozilla/configure.in
index 335b86bb459..b6eebba8c05 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -1136,6 +1136,8 @@ xpcom/public/Makefile
 xpcom/src/Makefile
 xpcom/tests/Makefile
 xpcom/tests/dynamic/Makefile
+xpcom/tools/Makefile
+xpcom/tools/xpidl/Makefile
 xpfe/Makefile
 xpfe/xpviewer/Makefile
 xpfe/xpviewer/src/Makefile