In another thread, @Zed helpfully linked to a previous topic about this:
The pull request mentioned in that post is here:
The request was accepted, so I think the issue should be fixed in the newest releases, but it might not have been backported to previous IDE versions. You could try upgrading to the newest version of the IDE that comes with Inform 10, and then either port your project to Inform 10 or choose an older compiler version in the settings.