diff --git a/js/api.js b/js/api.js
index d250428..0db9811 100644
--- a/js/api.js
+++ b/js/api.js
@@ -589,7 +589,7 @@ async function hideDisabledFeatures() {
     hangman:       ['/hangman'],
     crossword:     ['/crossword'],
     pet:           ['/pet'],
-    red_book:      ['/red-book.html', '/red-book-ecosystem.html', '/red-book-biomes.html'],
+    red_book:      ['/red-book', '/red-book.html', '/red-book-ecosystem.html', '/red-book-biomes.html'],
     collection:    ['/collection.html', '/collection'],
     lab:           ['/lab'],
     knowledge_map: ['/knowledge-map'],
@@ -624,7 +624,7 @@ async function hideDisabledFeatures() {
     const classOnlyHrefs = [
       '/board', '/lab', '/hangman', '/crossword', '/pet',
       '/collection', '/collection.html', '/knowledge-map',
-      '/red-book.html', '/red-book-ecosystem.html', '/red-book-biomes.html',
+      '/red-book', '/red-book.html', '/red-book-ecosystem.html', '/red-book-biomes.html',
       '/flashcards', '/live-quiz',
     ];
     classOnlyHrefs.forEach(href => {