diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index ce5a7b8..77b9d7d 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -9,6 +9,7 @@ describe Rscons do
         FileUtils.cp_r(build_test_rel_path, 'build_tests/test')
         @owd = Dir.pwd
         Dir.chdir('build_tests/test')
+        $stdout.stub(:puts) { nil }
       end
       instance_eval(File.read(File.join(build_test_rel_path, 'spec.rb')))
       after do