How to include pull requests from fork when specifying sha

Below is the query I use to find associated PRs for a given sha but it doesn’t include PRs if they are from forks.
How can I modify it to also include PRs from forks?

query associatedPRs($sha: String, $repo: String!, $owner: String!){
  repository(name: $repo, owner: $owner) {
    commit: object(expression: $sha) {
      ... on Commit {
        associatedPullRequests(first:5){
          edges{
            node{
              title
              number
              body
            }
          }
        }
      }
    }
  }
}