--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -1794,17 +1794,17 @@ GeckoDriver.prototype.clickElement = fun
  */
 GeckoDriver.prototype.getElementAttribute = function*(cmd, resp) {
   let {id, name} = cmd.parameters;
 
   switch (this.context) {
     case Context.CHROME:
       let win = this.getCurrentWindow();
       let el = this.curBrowser.seenEls.get(id, {frame: win});
-      resp.body.value = el[name];
+      resp.body.value = el.getAttribute(name);
       break;
 
     case Context.CONTENT:
       resp.body.value = yield this.listener.getElementAttribute(id, name);
       break;
   }
 };