Laravel pagination: Append query parameter without value

I have a pagination-instance where I want to append all query parameter from the request to the next_page_url attribute.

I have query parameter with a value like &name=chris but I also have single parameter without a value like &xyz.

However, when I append all query parameters to the pagination instance, like so:

$query->simplePaginate(50)->appends($request->all());

only parameters with a value are getting appended.

How can I append all parameters to the next_page_url?

Update

I want to append query parameters to get the next chunk of requested data.

If I don't, it always gives back "next_page_url":"http://vue.dev/contacts?page=2". What I want is "next_page_url":"http://vue.dev/contacts?name&page=2"

Even though Fahmis solution is possible as well, I end up using the approach from this so-question. This has the advantage that php reads the parameter as an array automatically. My url end up looking like this:

http://vue.dev/contacts?page=2&select[]=xyz&select[]=abc