diff --git a/e2etestrunner.js b/e2etestrunner.js
index 4f2f785..0414a15 100755
--- a/e2etestrunner.js
+++ b/e2etestrunner.js
@@ -80,7 +80,7 @@ function getLatestBoxVersion(callback) {
 function runTests(latestVersionInfo, callback) {
     debug('Running tests for %j', latestVersionInfo);
 
-    gNpmTest = shell.system('e2etestrunner', 'npm run-script parallel_test', { env: [ 'BOX_VERSION=' + latestVersionInfo.version ] }, function (error, stdout, stderr) {
+    gNpmTest = shell.system('e2etestrunner', 'npm run-script parallel_test', { env: { BOX_VERSION: latestVersionInfo.version } }, function (error, stdout, stderr) {
         gNpmTest = null;
         debug('Final test result', error);