BuddyBar To WP Bar For Admin?

I have tired a few functions.php methods, but everything I try, such as:

if( current_user_can('administrator') ) {

		define( 'BP_USE_WP_ADMIN_BAR', true );
	}

or

if( current_user_can('administrator') ) {

		define( 'BP_DISABLE_ADMIN_BAR', true );
	}

...all seem to completely remove all bars, leaving no bar at all. But what I want is exactly this:

Change the BuddyPress Bar back to the normal WP Admin Bar only for the administrators.

Thanks!