--- a/testing/geckodriver/src/capabilities.rs
+++ b/testing/geckodriver/src/capabilities.rs
@@ -504,12 +504,10 @@ mod tests {
 
         let prefs_set = profile.user_prefs().unwrap();
         println!("{:#?}", prefs_set.prefs);
 
         assert_eq!(prefs_set.get("startup.homepage_welcome_url"),
                    Some(&Pref::new("data:text/html,PASS")));
         assert_eq!(prefs_set.get("browser.display.background_color"),
                    Some(&Pref::new("#00ff00")));
-        assert_eq!(prefs_set.get("marionette.defaultPrefs.port"),
-                   Some(&Pref::new(2828)));
     }
 }