diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index d9caf1e..ce5a7b8 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -4,10 +4,17 @@ describe Rscons do
   FileUtils.rm_rf('build_tests/test')
   test_dirs = Dir['build_tests/*/']
   test_dirs.each do |build_test_rel_path|
-    FileUtils.cp_r(build_test_rel_path, 'build_tests/test')
-    Dir.chdir('build_tests/test') do
-      instance_eval(File.read('spec.rb'))
+    context build_test_rel_path do
+      before do
+        FileUtils.cp_r(build_test_rel_path, 'build_tests/test')
+        @owd = Dir.pwd
+        Dir.chdir('build_tests/test')
+      end
+      instance_eval(File.read(File.join(build_test_rel_path, 'spec.rb')))
+      after do
+        Dir.chdir(@owd)
+        FileUtils.rm_rf('build_tests/test')
+      end
     end
-    FileUtils.rm_rf('build_tests/test')
   end
 end