GitHub fetch upstream before doing "Rebase my GitHub fork"

When I do menu "VSC / Git / Rebase my GitHub fork", it doesn't fetch upstream first - so the rebase is prettty pointless. Is there anyway to configure it to fetch upstream first?

Here's one of my repo's:

$ git remote -v
origin  git@github.com:ge0ffrey/optaplanner-wb.git (fetch)
origin  git@github.com:ge0ffrey/optaplanner-wb.git (push)
upstream        git@github.com:droolsjbpm/optaplanner-wb.git (fetch)
upstream        git@github.com:droolsjbpm/optaplanner-wb.git (push)

What I 'd like it to do from IntelliJ is, presuming that I am on branch master:

$ git fetch upstream // doesn't need to be all of upstream, just master is enough
$ git rebase upstream/master