DOTS: Depends On The Situation! Maybe half a "stop" of additional exposure if there's a suspected loss of speed.
A test clip would be advisable if the film images are important. See below.

Depending on the age and speed of the film, at worst, it might take on a slight or even a heavy base fog especially if it's an aged roll 400 ISO or higher or to be developed in a high-energy developer. Back in the day, we might do a film clip, a 6-inch piece of film from the front of the roll in question and develop it normally and compare with a previously normally developed clip. If the clip showed some fog, we used some Edwal Anti-fog solution or Kodak's Anti-fog #1, a tablet that contained 0.45 grain (0.03 grams) of Benzotriazole.

Be well! Ed