diff --git a/demo/polyfills.js b/demo/polyfills.js
index 7f83c7eab..69dc753c8 100644
--- a/demo/polyfills.js
+++ b/demo/polyfills.js
@@ -1,3 +1 @@
-if (typeof Promise === 'undefined') {
-  import('core-js/fn/promise')
-}
+import('core-js/fn/promise')