Blade @inject

I'm in the process of upgrading to Lumen 5.2 and my @inject() calls seem to have stopped working. This is the error I'm getting:

ErrorException in Container.php line 736:
Class url does not exist (View: x) (View: x)

And the code:

@inject('url', 'Illuminate\Support\Facades\URL')
<link type="image/x-icon" rel="icon" href="{{ $url::to('favicon.ico') }}" />