diff --git a/build.sh b/build.sh
index ca40aefb8de..41af5aa2953 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,5 @@
  alias set_gemfile='export BUNDLE_GEMFILE="`pwd`/Gemfile"'
+ bundle check || bundle install
  bundle exec rake test_app
  cd api; set_gemfile; bundle install; bundle exec rspec spec
  cd ../backend; set_gemfile; bundle install; bundle exec rspec spec