diff --git a/lib/chromedriver.js b/lib/chromedriver.js
index 198e623..4e7de5c 100644
--- a/lib/chromedriver.js
+++ b/lib/chromedriver.js
@@ -17,7 +17,7 @@ import _ from 'lodash';
 import path from 'path';
 import {compareVersions} from 'compare-versions';
 import { ChromedriverStorageClient } from './storage-client/storage-client';
-import {toW3cCapNames, getCapValue} from './protocol-helpers';
+import {toW3cCapNames, getCapValue, toW3cCapName} from './protocol-helpers';
 
 const NEW_CD_VERSION_FORMAT_MAJOR_VERSION = 73;
 const DEFAULT_HOST = '127.0.0.1';
@@ -554,7 +554,7 @@ export class Chromedriver extends events.EventEmitter {
       if (_.isPlainObject(chromeOptions)) {
         chromeOptions.w3c = true;
       } else {
-        this.capabilities['goog:chromeOptions'] = {w3c: true};
+        this.capabilities[toW3cCapName('chromeOptions')] = {w3c: true};
       }
     }
 
diff --git a/lib/protocol-helpers.js b/lib/protocol-helpers.js
index 22b6225..4cc0346 100644
--- a/lib/protocol-helpers.js
+++ b/lib/protocol-helpers.js
@@ -7,7 +7,7 @@ const W3C_PREFIX = 'goog:';
  *
  * @param {string} capName
  */
-function toW3cCapName (capName) {
+export function toW3cCapName (capName) {
   return (_.isString(capName) && !capName.includes(':') && !isStandardCap(capName))
     ? `${W3C_PREFIX}${capName}`
     : capName;