diff --git a/lib/plugins/registry.js b/lib/plugins/registry.js
index 90b8539d8..fe9406dde 100644
--- a/lib/plugins/registry.js
+++ b/lib/plugins/registry.js
@@ -145,6 +145,7 @@ function listPlugins(book) {
     return Promise.all([
         listInstalled(path.resolve(__dirname, '../..')),
         listInstalled(book.root),
+        book.originalRoot? listInstalled(book.originalRoot) : Promise([]),
         book.isLanguageBook()? listInstalled(book.parent.root) : Promise([])
     ])
     .spread(function() {