The 23-year-old has clearly not taken too long to convince his manager that he deserves an extension.
The 23-year-old's previous deal was set to run until the summer of 2017, but Wagner was obviously keen to make the attacker an integral part of his plans at the John Smith's Stadium, as he explained that he wants the former Manchester City trainee to be held up as an example to his younger teammates.
"Hopefully we will have successful years together," he said.
"He is exactly the type of player I like and prefer. He is an offensive-thinking player who likes to work very hard and can work defensively. He is also a good age.
"Harry is an example to those in the Under-21 team now.
"If you are patient and work hard, you will get a chance here," he added.
Bunn has become something of a utility man for the Terriers this season, having played on the left of midfield, as a winger and as an attacking midfielder, as well as a striker. Despite the regular changing of his role in the side, he has maintained a solid level of performance, with two goals and four assists already.
With Wagner having managed Borussia Dortmund's youth team in the past, it is fair to say that he has a very good understanding of what attributes it takes for a youngster to make their name in the senior side.
And having now committed himself for another two years, it appears that Bunn has many of those attributes that Wagner was looking for.