The 37-year-old still gets nervous on the panel show, despite making a record tenth appearance as a guest presenter tonight.
He said: "It depends what mood team captains Paul Merton and Ian Hislop are in. Paul can be rather waspish and give you a rough ride.
"In one show I hosted, Paul and comic Ross Noble were determined not to win a single point and they made it very hard work for me. Maybe they’ll be nice to me this time and I think I deserve an award for creating the record.”
Armstrong has become a favourite guest host with viewers since the departure of Angus Deayton in 2002.
He is to reunite with comedy partner Ben Miller in a new series of Armstrong and Miller next week.
Have I Got News For You airs at 9.30pm tonight on BBC One.