He scored only his second goal since April 2012 on Tuesday against Bayer Leverkusen and Moyes hopes there are a few more to come.
"He's done very well," said the Scot.
"They kept telling me that he needed to change his number, so we got that changed for him because sometimes psychologically it can make a difference to a player.
"Overall, I've been really pleased with him.
"I actually said to him today 'you should be getting yourself seven or eight goals a season regularly'.
"He squinted at me a bit but hopefully he knows what I mean.
"He only got one last season but he's got off to a good start and hopefully he'll get close to the target I'd like to him get this season."