how to compile/validate group of json-schema files that might reference each other in v4+

Scenario: Directory with several JSON-schema files, some of which might `$ref`erence the others. Each schema file defines a unique `$id` property.
I want to compile/validate them all at once

This command worked in ajv-cli v3.x:
`ajv -s 'src/models/*.json' -r 'src/models/*.json'`

But with 4.x and 5.0, I get errors like this:
`error: schema with key or id "https://mycompany.com/this/schema/model.json" already exists`

But the only file that has that id is the file itself in that directory. It would seem that the -r flag is not excluding the file's self when checking for duplicate ids in that referenced list.

How can I accomplish validating a group of schemas like this with the newer version?