diff --git a/app/assets/javascripts/discourse/testem.js b/app/assets/javascripts/discourse/testem.js
index a0c880fff71..94c77831ba1 100644
--- a/app/assets/javascripts/discourse/testem.js
+++ b/app/assets/javascripts/discourse/testem.js
@@ -44,7 +44,7 @@ module.exports = {
   launch_in_ci: ["Chrome"],
   // launch_in_dev: ["Chrome"] // Ember-CLI always launches testem in 'CI' mode
   tap_failed_tests_only: false,
-  parallel: 1, // disable parallel tests for stability
+  parallel: -1,
   browser_start_timeout: 120,
   browser_args: {
     Chrome: [