Clarification of incorrect technical answer during interview

So the situation is, the interviewer asked me how to get equity value from enterprise value, as basic as it was. I was a bit nervous and said something like "to get EQUITY VALUE, you sum up EQUITY VALUE and cash and subtract debt"

I could sense the interviewer must be like "W*F" and he asked if I was sure. He then asked why I would subtract debt from equity value given I said equity value was only available to common share holders.

I pondered 5 secs and realized I was wrong, so I said "I must clarify my answer" and then I gave the correct formula.

The interviewer did ask another question to test my knowledge of the same topic and I did well.

I know I looked stupid, but will that be penalized?