diff --git a/lib/legacy/polymer.dom.js b/lib/legacy/polymer.dom.js
index fa853a38f8..c7f2b04693 100644
--- a/lib/legacy/polymer.dom.js
+++ b/lib/legacy/polymer.dom.js
@@ -42,7 +42,7 @@ export const matchesSelector = function(node, selector) {
  * @implements {PolymerDomApi}
  * @unrestricted
  */
-class DomApi {
+let DomApi = class {
 
   /**
    * @param {Node} node Node for which to create a Polymer.dom helper object.
@@ -378,7 +378,7 @@ DomApi.prototype.textContent;
 /** @type {string} */
 DomApi.prototype.innerHTML;
 
-let DomApiImpl = DomApi;
+export {DomApi};
 
 if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noPatch'] && window['ShadyDOM']['Wrapper']) {
 
@@ -395,7 +395,7 @@ if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noP
     }
   });
 
-  DomApiImpl = Wrapper;
+  DomApi = Wrapper;
 
   Object.defineProperties(EventApi.prototype, {
 
@@ -434,8 +434,6 @@ if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noP
   ]);
 }
 
-export {DomApiImpl as DomApi};
-
 /**
  * Legacy DOM and Event manipulation API wrapper factory used to abstract
  * differences between native Shadow DOM and "Shady DOM" when polyfilling on
@@ -452,7 +450,7 @@ export {DomApiImpl as DomApi};
  */
 export const dom = function(obj) {
   obj = obj || document;
-  if (obj instanceof DomApiImpl) {
+  if (obj instanceof DomApi) {
     return /** @type {!DomApi} */(obj);
   }
   if (obj instanceof EventApi) {