The 28-year-old striker, signed on a free transfer from Derby last week, was on target in his first Pompey appearance, a 4-0 friendly win over Havant & Waterlooville.
He said: "I've scored on my debut for the last three clubs that I've been at. It helps you to settle quickly and lets the lads see what you're about.
"But it was more important to get 90 minutes in the legs really. We had a good work-out and got a decent result at the end of it."
Joel Ward, Hayden Mullins and Dave Kitson were also on target for Pompey.