diff --git a/lib/legacy/polymer.dom.js b/lib/legacy/polymer.dom.js
index ff5d33b41f..6574e72884 100644
--- a/lib/legacy/polymer.dom.js
+++ b/lib/legacy/polymer.dom.js
@@ -248,7 +248,7 @@ function forwardProperties(proto, properties) {
  * Event API wrapper class returned from `dom.(target)` when
  * `target` is an `Event`.
  */
-class EventApi {
+export class EventApi {
   constructor(event) {
     this.event = event;
   }