diff --git a/lib/firefox/webdriver/firefox.js b/lib/firefox/webdriver/firefox.js
index 3dcda229e..9536f588b 100644
--- a/lib/firefox/webdriver/firefox.js
+++ b/lib/firefox/webdriver/firefox.js
@@ -94,7 +94,7 @@ export class Firefox {
     }
 
     if (this.options.basicAuth) {
-      await this.bidi.setBasicAuth(this.options.basicAuth);
+      await this.browsertimeBidi.setBasicAuth(this.options.basicAuth);
     }
 
     if (