diff --git a/cms/templates/textbooks.html b/cms/templates/textbooks.html
index 4c31adb5c4..b46e0f73a4 100644
--- a/cms/templates/textbooks.html
+++ b/cms/templates/textbooks.html
@@ -55,6 +55,9 @@ CMS.Models.Textbook = Backbone.AssociatedModel.extend({
             response.chapters = {"url": response.url};
             delete response.url;
         }
+        _.each(response.chapters, function(chapter, i) {
+            chapter.order = chapter.order || i+1;
+        })
         return response;
     },
     toJSON: function() {