diff --git a/tasks/behat.js b/tasks/behat.js
index 62ee06ab..16fa9f51 100644
--- a/tasks/behat.js
+++ b/tasks/behat.js
@@ -61,9 +61,9 @@ module.exports = function(grunt) {
               maxProcesses: 5,
               bin: 'vendor/bin/behat',
               debug: true,
-              env: {
+              env: _.extend({}, process.env, {
                 "BEHAT_PARAMS": "{\"extensions\": {\"Drupal\\\\DrupalExtension\": {\"drupal\": {\"drupal_root\": \"./" + config.buildPaths.html + "\"}}, \"Behat\\\\MinkExtension\": {\"base_url\": \"" + config.siteUrls[key] + "\", \"zombie\": {\"node_modules_path\": \"" + process.cwd() + "/node_modules/\"}}}}"
-              }
+              })
             }, options)
           }
         );