diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index 4830c5d..55ae5ec 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -74,6 +74,8 @@ describe Rscons do
     command_name = "#{command_prefix}#{@statics[:build_test_id]}"
     File.open("_simplecov_setup.rb", "w") do |fh|
       fh.puts <<EOF
+require "bundler"
+Bundler.setup
 require "simplecov"
 class MyFormatter
   def format(*args)