As normal. It works well that way with all my meters in all modes: studio flash, ambient, TTL, contrasty, low contrast, incident, reflected, spot, averaging...
I find that it gives me a bit fuller shadow detail with a less grainy look in the shadows. At 160 it's just a hair too thin in the shadows for my taste. It's only a third of a stop after all, but the 125 rating suits my usage.
PE has posted on this method of giving a bit extra exposure with color negative film several times here on APUG, and it fits my personal observations over the years. I don't automatically downrate all color neg films, but I find I like some films better this way, and make the adjustment after considerable shooting under highly varied conditions. In part I think it's a tendency of manufacturers who want to advertizing a higher film speed to err on the side of being generous about film speeds.
Lee