It was his eighth goal of the season and ended a four-game barren spell.
Cisse said: "It's the top one this year. I haven't scored too many goals this year. It's difficult for me sometimes, but I try all the time.
"Last year, it was too easy - I shot and it was a goal - but this year, I don't know, it's a little bit more difficult.
"But I try - maybe it's coming."