How to make a field required in an incident workflow?

I created an incident workflow and set it to Active and Default.  I want to make the "Component" field mandatory when Step is New.  I did the following steps but the Component field is still not mandatory (does not have asterisk next to field, and allows incident to save with this field empty).

Go to Administration > Incidents > Edit Workflows. Click the "Steps" button of the Active Workflow.

For the "New" Step Name:

1. Click on the Step Name
2. Scroll to the Incident Fields table
3. Check the right most checkbox for "Component" (the checkbox labeled "Required")
4. Click "Save"

Is this a bug?