diff --git a/test/browser.test.js b/test/browser.test.js
index d4c3846..869b451 100644
--- a/test/browser.test.js
+++ b/test/browser.test.js
@@ -9,6 +9,8 @@ var vm = require('vm');
 describe('browser support', function() {
   this.timeout(60000); // 60s to give browserify enough time to finish
 
+  beforeEach(sandbox.reset);
+
   it('has API for bundling and executing boot instructions', function(done) {
     var appDir = path.resolve(__dirname, './fixtures/browser-app');