diff --git a/bin/sandbox b/bin/sandbox
index f342e720dcd..1eb3cc80034 100755
--- a/bin/sandbox
+++ b/bin/sandbox
@@ -40,6 +40,13 @@ function unbundled {
 echo "~~~> Removing the old sandbox"
 rm -rf ./sandbox
 
+mkdir -p sandbox/app/assets/config
+cat <<MANIFEST > sandbox/app/assets/config/manifest.js
+//= link_tree ../images
+//= link_directory ../javascripts .js
+//= link_directory ../stylesheets .css
+MANIFEST
+
 echo "~~~> Creating a pristine Rails app"
 rails_version=`bundle exec ruby -e'require "rails"; puts Rails.version'`
 bundle exec rails _${rails_version}_ new sandbox \