diff --git a/src/utils/first.js b/src/utils/first.js
index 43a12f4..f703735 100644
--- a/src/utils/first.js
+++ b/src/utils/first.js
@@ -1,3 +1,5 @@
+import Promise from 'es6-promise/lib/es6-promise/promise';
+
 // Return the first non-falsy result from an array of
 // maybe-sync, maybe-promise-returning functions
 export default function first ( candidates ) {