Job interviews can make even the most prepared candidates uncomfortable. But although the hiring manager is in the driver’s seat, there’s a chance they’ll make a wrong turn and ask a question that is off limits—a question that you don’t have to answer, and sometimes definitely shouldn’t. That’s why you need to be able to spot illegal interview questions.

“Even trained hiring managers and recruiters sometimes ask illegal questions,” says Charles Krugel, an HR attorney in Chicago.

The Civil Rights Act of l964 “prohibits employment discrimination based on race, color, religion, sex and national origin.” As a job seeker, you want to be able to spot red flags that could indicate you’re not being treated fairly. These five interview questions are illegal for potential employers to ask you.

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